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Guadalcanal Radar Detachment
SCR-270B utilized by the Guadalcanal Early Warning Detachment in late 1942.
Active	June, 1942 - March 1943
Country	United States
Allegiance	United States of America
Branch	United States Marine Corps
Role	Early warning
Part of	N/A
Engagements	World War II Battle of Guadalcanal
Commanders
Notable commanders	LtCol Walter L. J. Bayler

The Marine Corps Early Warning Detachment, Guadalcanal (1942–43) was a ground based early-warning radar detachment that provided long range detection and rudimentary fighter direction against Japanese air raids during the Battle of Guadalcanal. Initially deployed as part of the headquarters of Marine Aircraft Group 23, this detachment established an SCR-270 long range radar that allowed the Cactus Air Force to husband its critically short fighter assets during the early stages of the battle when control of the island was still very much in doubt. The detachment arrived on Guadalcanal on 28 August 1942, began operating in mid-September, and did not depart until early March 1943. Combat lessons learned from this detachment had a great deal of influence on the Marine Corps' development of its own organic, large scale air warning program which began in early 1943.

History

Background

Dermott H. MacDonnell enlisted into the Marine Corps in Boston, Massachusetts on 9 April 1942, and immediately attained the rank of Staff Sergeant based on previous technical experience. He was immediately sent to Marine Corps Base Quantico, Virginia to attend the Marine Corps' newly established radar school. Two months later he led a detachment of nine Marines attached to Marine Aircraft Group 12 (MAG-12) at Camp Kearney in San Diego, California for a few weeks of training on radar problems in the California desert. The detachment departed San Diego at the end of July and arrived in Oahu, Hawaii on 3 August joining Marine Aircraft Group 23 (MAG-23). The Marines immediately boarded another ship headed west for Efate with follow on orders to Guadalcanal.

In December 1941, then Major Walter L. J. Bayler became the "Last Man off Wake Island" because it was imperative that the Marine Corps remove him before the fall of Wake because he was one of the few Marine Corps officers that had experience establishing air-ground communications networks and he also had knowledge of the United States' still top secret radar program. Bayler was later sent to Midway to establish radar posts and fighter direction networks to support the 6th Defense Battalion prior to the Battle of Midway. Bayler flew into Guadalcanal himself, piloting a Grumman J2F Duck on 29 August 1942. Serving as the communications officer for Marine Aircraft Group 23, his mission once again was to establish air-to-ground communications facilities.

On 7 August 1942, the First Marine Division landed on Tulagi and Guadalcanal at Lunga Point, capturing the partially completed Japanese airfield and marking the first counter-offensive taken by the Allies in the Pacific Theater. Air interdiction and combat air patrol over the newly established beachhead were provided by aircraft from the aircraft carriers USS Enterprise (CV-6), USS Saratoga (CV-3) and USS Wasp (CV-7). Three naval aviators from the Wasp were detailed to the Tulagi Task Force flag ship USS Neville (APA-9) to serve as fighter directors while two naval aviators from the Enterprise controlled from the Guadalcanal Task Force flag ship USS McCawley (APA-4).

When the Navy's carriers departed early in the campaign, it became readily apparent that the Marine Corps had failed to properly plan for land based fighter direction. This left the nascent beachhead exposed to enemy air attacks for nearly six weeks after the initial landing. More construction work began on Henderson immediately, mainly using captured Japanese equipment. On 12 August, the airfield was renamed Henderson Field, for Major Lofton R. Henderson, who was killed during the Battle of Midway and who was the first Marine Corps pilot killed during the battle. By 18 August, Henderson Field was ready for operation. On 3 September, the commander of the 1st Marine Aircraft Wing, U.S. Marine Brigadier General Roy S. Geiger, arrived with his staff and took command of all air operations at Henderson Field. Air battles between the Allied aircraft at Henderson and Japanese bombers and fighters from Rabaul continued almost daily.

After the initial landings, the Japanese began immediately sending bombers and fighters south from the main airbases at Rabaul, Buka & Buin. On the morning of 7 August, the Imperial Japanese Navy's 5th Air Attack Force's air strength consisted of 39 fighters, 32 medium bombers, 16 dive bombers, and 17 seaplanes, including the 15 seaplane aircraft at Tulagi that were destroyed in the initial Allied air strikes during the landings on Tulagi and Guadalcanal. Air battles between Allied aircraft at Henderson and Japanese bombers and fighters from Rabaul continued almost daily for the opening months of the campaign. The eight-hour round-trip flight from Rabaul to Guadalcanal, about 1,120 miles (1,800 km), seriously hampered Japanese efforts to establish air superiority over Henderson Field.

On 20 August, the first Marine pilots landed their aircraft at Henderson Field. As part of MAG-23, flying from the escort aircraft carrier USS Long Island, these first aircraft included 18 x F4F Wildcat fighter planes of VMF-223 led by Major John L. Smith and 12 x SBD Dauntless dive bombers of VMSB-232 led by Lt. Colonel Richard Mangrum. These aircraft were operational the next day and conducted combat missions.

Operation ashore on Guadalcanal

Newly promoted Master Technical Sergeant MacDonnell and his detachment arrived on Guadalcanal on 28 August. The detachment's gear was unable to get ashore that day as the ships quickly steamed off for the safety of Tulagi harbor based on reports of an incoming Japanese air raid. This delayed the setting up of radar equipment as it was unloaded at Tulagi and had to be ferried back over to Guadalcanal via Landing craft tank. On 2 September, the 3rd Defense Battalion began operating its SCR-270 early-warning radar (callsign Radar One) at Henderson Field, which, along with reports from the coastwatchers, provided the first early warning of incoming Japanese warplanes. The radars of the 3d Defense Battalion were meant to cue air defense artillery and were not able to provide fighter direction to friendly aircraft to assist with aerial intercepts. A few days later two additional SCR-268 fire-control radars also became operational to provide more accurate data for the battalion's 90mm anti-aircraft weapons.

"In short, improvisation under wretched conditions was the key to Cactus operations."

The detachment selected a site for their radar on top of a hill a mile south of Henderson Field and began operations on 20 September. The radars on Guadalcanal were not part of a larger air defense network in the Solomon Islands. The individual radars provided information via landline to the firing batteries of the 3d Defense Battalion and to the 1st Marine Aircraft Wing's fighter directors led by LtCol Bayler. At the outset of the campaign, Maj Joseph N. Renner, the MAG-23 Operations Officer, also provided ad-hoc fighter control when able. Because the Marine Corps had no doctrine for conducting fighter direction in concert with anti-aircraft artillery the actions of these two radars units and the fighter controllers were not integrated or operationally aligned. Upon receiving radar reports of an incoming Japanese air raid, the fighter director was driven, in a special communications truck outfitted with a salvaged radio from a wrecked Grumman F4F Wildcat, to a control center about a mile away that had been dug into the side of a hill. From there the fighter director controlled the intercept. They had also worked out a series of flag signals to alert all of the Marines in the vicinity of the 1st MAW headquarters building about the status of Japanese air activity. No flag flying from the top of the headquarters meant "all clear," or Condition Green. When a Japanese raid was inbound, a white flag was flown to signify Condition Yellow along with the sounding of a siren. When the raid was two minutes out, a black flag was raised for Condition Red, meaning everyone should find shelter quickly.

During the course of the battle the men and equipment of the radar detachment were constantly exposed to enemy small arms fire, artillery shelling, naval gunfire, and aerial bombardment. MTSgt MacDonnell's efforts keeping the SCR-270 operational during this time was key to the air defense of Guadalcanal. MTSgt MacDonnell also proved to be a fantastic radar operator who pioneered new tactics and techniques for the SCR-270. Knowing that the radar array could tilt backwards 10 degrees, MacDonnell determined that by taking a reading at both perpendicular and tilted backwards an approximate altitude could be derived. He also became adept at deciphering the returns on the radar's oscilloscope to determine the number and mixture of aircraft headed towards Guadalcanal. Applying radars returns against his knowledge of the aircraft formations of the Tainan Air Group he noticed radar echoes that jiggled, which coupled with airspeed, highlighted the location of the Mitsubishi A6M Zeros in the formations.

Additional fighter controllers arrived on 8 October 1942, when Navy Lieutenant Lewis C Mattison led a detachment of four controllers having recently graduated from the Navy's Fighter Director School at Pearl Harbor. In 1 November MAW Control Center migrated to a dugout in the side of a hill that offered better protection against enemy fires, improved air-ground communications, and enhanced coordination between fighter directors and ground based air defense units.

The Marine radar detachment on Guadalcanal was relieved by a radar crew from the Royal New Zealand Air Force in March 1943. At the time there was a shortage of American radars available for the Pacific so Admiral William Halsey asked the New Zealand government if they could assist. The Marine Corps attached three officers and a senior NCO to this detachment, led by Major Ethridge C. Best, to assist with training and to provide liaison with American fighter units.

Legacy

The Japanese inability to retake Guadalcanal is largely to do with air operations conducted by the Cactus Air Force. The early warning radars and fighter direction provided by the Guadalcanal Radar Detachment were critical to that effort by allowing the Cactus Air Force to husband its critically short fighter planes during the most desperate days of the battle when supply lines were tenuous at best. Instead of maintaining a permanent combat air patrol overhead, fighters were held on the ground until Japanese aircraft were inbound from the Northern Solomon Islands. Difficult coordination between the 1st MAW's Fighter Direction Center and the 3d Defense Battalion highlighted to Marine leadership that tactics, techniques and procedures needed to be developed for fighter aircraft operating in the vicinity of friendly anti-aircraft artillery. This detachment was never part of the early lore of the Cactus Air Force immediately after the battle because radar was still a top secret technology thus its contributions were never properly added as the first stories from Guadalcanal were being written.

The development of the Marine Corps' night fighter program was further hastened by reports from the Cactus Air Force on Guadalcanal that enemy night raids were having debilitating effects on the Marines on the ground. The Japanese sent solitary aircraft, nicknamed Washing Machine Charlie, on night-time missions over Guadalcanal to bomb airfield and installations, drop flares over Allied positions to assist Japanese naval or ground forces operating on or near the island, and harass troops and disrupt their sleep. Marine Night Fighting Squadron 531 (VMF(N)-531) was commissioned on 16 November 1942, with its own stand alone GCI Detachment to specifically combat against these night hecklers. VMF(N)-531, with its GCI Detachment, deployed overseas in August 1943 and eventually controlled the first successful night interception in the Pacific working with an F4U-2 Corsair from the U.S. Navy's VF(N)-75.

LtCol Bayler received a Legion of Merit for his actions during the Battle of Guadalcanal. He returned to the United States in February 1943 just as the Commandant of the Marine Corps was convening a "Radar Policy Board." The board was tasked with making recommendations regarding the establishment of a program for radar early warning, radar fire control, and radar fighter direction for Marine Corps units during amphibious operations. Board recommendations included the organization of air warning squadrons and groups requiring nearly 12,000 officers and Marines, placing organic fighter direction with night fighter squadrons and the creation of an Air Defense Section within the Division of Aviation at Headquarters Marine Corps. The report, "Standard Operating Procedures for Radar Air and Surface Warning and Radar Fire Control in the Marine Corps," was published on 17 March 1943, and later endorsed by the Commandant of the Marine Corps on 4 May 1943. On 1 July 1943 newly promoted Colonel Bayler became the first Commanding Officer of the 1st Marine Air Warning Group. He remained in this role for the next 9 months overseeing the establishment of the first thirteen air warning Squadrons. During this time he also helped co-author a book with Cecil Carnes on his early experiences in the war titled Last Man Off Wake Island.

Dermott H. MacDonnell remained on Guadalcanal until March 8, 1943, and was awarded the Silver Star and a field commission for his actions maintaining the SCR-270 radar during the campaign. Lieutenant MacDonnell returned to Marine Corps Air Station Cherry Point as a radar instructor with 1st MAWG. After his tour as an instructor, he was assigned to Air Warning Squadron 6 and participated in the Battle of Okinawa as a fighter controller. He remained in the Marine Corps and later served as a company commander of the 1st Marine Division's Reconnaissance Company during the Korean War.

Gallery

• The Pagoda where LtCol Bayler maintained his watch prior to enemy air raids.
• F4F-4 Wildcats on Guadalcanal

See also

• United States Marine Corps Aviation
• Marine Air Command and Control System

Notes

1. Frank 1990, pp. 2007.
2. ^ Sherrod 1952, pp. 442.
3. Shettle 2001, pp. 29.
4. April 1942 Muster Rolls for "Headquarters, Eastern Recruiting Division, Philadelphia, PA."
5. Murray 1946, pp. 29–30.
6. Simmons & Smith 1995, pp. 150–151.
7. ^ Simmons & Smith 1995, pp. 151.
8. ^ Murray 1946, pp. 30.
9. Bayler & Carnes 1943, pp. 146–362.
10. Bayler & Carnes 1943, pp. 229–30.
11. ^ Lundstrom 2005, pp. 185.
12. ^ Frank 1990, pp. 125–127.
13. DANFS CV-6 2017.
14. Boslaugh, David L. (1999). "Radar and the Fighter Directors". IEEE Computer Society Press. Retrieved 5 August 2021.
15. ^ Mattison 1943, pp. 8.
16. "Lofton R. Henderson, Maj, USMC". U.S. Naval Academy Virtual Memorial Hall. Run To Honor. 10 November 2021. Retrieved 16 January 2022.
17. Hough p. 297
18. ^ Mattison 1943, pp. 2.
19. Lundstrom 2005, pp. 42.
20. Miller 1969, pp. 1, 9.
21. Hubler & De Chant 1944, pp. 40.
22. Shaw 1992, pp. 18.
23. Lundstrom 2005, pp. 96.
24. Mattison 1943, pp. 4.
25. Mattison 1943, pp. 17.
26. ^ Simmons & Smith 1995, pp. 152.
27. ^ Kreis 1988, pp. 228.
28. Bayler & Carnes 1943, pp. 250–51.
29. Lundstrom 2005, pp. 186.
30. Bayler & Carnes 1943, pp. 249.
31. Murray 1946, pp. 30–31.
32. ^ Kreis 1988, pp. 225.
33. Kreis 1988, pp. 229.
34. Telenko, Trent (19 May 2019). "The Guadalcanal Air Campaign's "Horseshoe Nail of Victory"". Chicago Boyz. Retrieved 5 August 2021.
35. Boslaugh, David L. (1999). "Fighter Direction Spreads from the Carriers - Chapter 9 of Radar and the Fighter Directors". ethw.org. Retrieved 5 August 2021.
36. Ross, John MacCaulay Sutherland (1955). "Despatch of No. 52 Radar Unit to Guadalcanal". Royal New Zealand Air Force. Retrieved 11 November 2020.
37. Frank 1990, pp. 207.
38. Kreis 1988, pp. 230.
39. Banks 1999, pp. 14.
40. Quilter & Chapin 2001, pp. 4.
41. Frank 1990, pp. 197.
42. Sherrod 1952, pp. 162–169.
43. Crowder 2000, pp. 161.
44. Porter & Hammel 1985, pp. 183.
45. "Walter L.J. Bayler". The Hall of Valor Project. Sightline Media Group. 2021. Retrieved 5 August 2021.
46. Air Warning Group 1 History (Report). United States Marine Corps Historical Division. 1949. pp. 1–14.
47. "1st Marine Air Warning Group Unit History" (PDF). United States Marine Corps. 1 January 1945. Retrieved 22 November 2019.
48. Ballenger 2001, pp. 88.

References

Bibliography

• Ballenger, Lee (2001). The Final Crucible: U.S. Marines in Korea 1953. Washington D.C.: Potomac Books Inc.
• Banks, Herbert C., ed. (1999). Marine Night Fighter Association. Turner Publishing Company. ISBN 1-56311-512-3.
• Bayler, LtCol Walter L.J.; Carnes, Cecil (1943). Last Man Off Wake Island. Cornwall, NY: The Cornwall Press.
• Crowder, Michael J. (2000). United States Marine Corps Aviation Squadron Lineage, Insignia & History - Volume One - The Fighter Squadrons. Paducah, KY: Turner Publishing Company. ISBN 1-56311-926-9.
• Frank, Richard B. (1990). Guadalcanal: The Definitive Account of the Landmark Battle. New York, NY: Penguin Books.
• Hubler, Richard G.; De Chant, John A (1944). Flying Leathernecks – The Complete Record of Marine Corps Aviation in Action 1941 – 1944. Garden City, New York: Doubleday, Doran & Co., Inc.
• Kreis, John F. (1988). Air Warfare and Air Base Air Defense 1914-1973 (PDF). Washington D.C.: Office of Air Force History.
• Lundstrom, John B. (2005). The First Team And the Guadalcanal Campaign: Naval Fighter Combat from August to November 1942 (New ed.). Naval Institute Press.
• Miller, Thomas G. (1969). Cactus Air Force. Admiral Nimitz Foundation. ISBN 0-934841-17-9.
• Porter, R. Bruce; Hammel, Eric (1985). Ace! - A Marine Night-Fighter Pilot in World War II. Pacifica, California: Pacifica Press.
• Quilter, Colonel Charles J.; Chapin, John C. (2001). A History of Marine Fighter Attack Squadron 531 (PDF). PCN 19000319600. Washington D.C.: History and Museums Division, Headquarters, United States Marine Corps. Retrieved 12 December 2008.
• Shaw, Henry I. (1992). "First Offensive: The Marine Campaign For Guadalcanal". Marines in World War II Commemorative Series. Retrieved 26 July 2006.
• Sherrod, Robert (1952). History of Marine Corps Aviation in World War II. Washington, D.C.: Combat Forces Press. ISBN 0-89201-048-7. OCLC 1261876.
• Shettle, M. L. (2001). United States Marine Corps Air Stations of World War II. Bowersville, Georgia: Schaertel Publishing Co. ISBN 0-9643388-2-3.
• Simmons, Ed; Smith, Norm (1995). ECHOES OVER THE PACIFIC: An overview of Allied Air Warning Radar in the Pacific from Pearl Harbor to the Philippines Campaign (PDF).

Journal

• Murray, Bill (1946). "Eyes in the Night" (PDF). Marine Corps Gazette. 30 (5): 28–31, 44. Retrieved 28 June 2020.

Report

• Mattison, Lieutenant Lewis C. (1943). Report on Fighter Direction at Cactus, 9 October 1942 - 1 January 1943 (Report).

Web

• Evans, Mark L. (26 April 2017). "Enterprise VII (CV-6)". Dictionary of American Naval Fighting Ships. Navy Department, Naval History and Heritage Command. Retrieved 15 November 2020.

v t e Marine Air Command and Control System
Marine Air Control Group 18	1st LAAD Bn Marine Air Control Squadron 4 Marine Air Support Squadron 2 Marine Wing Communications Squadron 18
Marine Air Control Group 28	2d LAAD Bn Marine Air Control Squadron 2 Marine Air Support Squadron 1 Marine Wing Communications Squadron 28
Marine Air Control Group 38	3d LAAD Bn Marine Air Control Squadron 1 Marine Air Support Squadron 3 Marine Wing Communications Squadron 38
Marine Air Control Group 48	Marine Air Control Squadron 24 Marine Air Support Squadron 6 Marine Tactical Air Command Squadron 48 Marine Wing Communications Squadron 48
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