Among these Marines were the first helicopter pilots of the United States Armed Forces to be formed into a unit for overseas combat service. Large-scale production of rotary-wing aircraft had come too late to have any effect on the tactics of World War II, though a few Sikorsky machines had been used experimentally both in the European and Pacific theaters toward the end of the conflict. But it remained for the United States Marine Corps to take the lead in working out combat techniques and procedures after organizing an experimental squadron, HMX-1, at Quantico in 1947. Seven pilots, 30 enlisted men and 4 HO3S-1 Sikorsky 2-place helicopters were detached from HMX-1 on 8 July 1950 for service with the Brigade. Upon arrival at El Toro, these elements were combined with 8 fixed-wing aircraft pilots, 33 enlisted men and 8 OY planes to form the Brigade’s air observation squadron, VMO-6. This is an example of how units were assembled at Pendleton and El Toro. Major Vincent J. Gottschalk, appointed commanding officer of VMO-6 on 3 July, had orders to ready his squadron for shipment overseas by the 11th. Thus he had just 48 hours, after the arrival of the Quantico contingent, in which to weld the elements of his outfit together. Among his other problems, Gottschalk had to grapple with the fact that there were not enough OY’s in good condition at El Toro. He found a solution by taking eight of these light observation planes overseas with a view to cannibalizing four of them for parts when the need arose.[65] [65] Lynn Montross, _Cavalry of the Sky_ (New York: Harper, 1954), Chapter VII. This book is devoted entirely to the operations of the U. S. Marine helicopter units organized from 1947 to 1953 for service both in the United States and overseas. There was not enough time in most instances for weapons familiarization training. Company A of the 1st Tank Battalion had been accustomed to the M4A3 Medium tank with either the 75-mm. gun or the 105-mm. howitzer. Activated on 7 July for service with the Brigade, the unit was equipped with M-26 “Pershing” tanks and 90-mm. guns. Captain Gearl M. English, the commanding officer, managed to snatch 1 day in which to take his men to the range with 2 of the new machines. Each gunner and loader was limited to 2 rounds, and the 90-mm. guns were never fired again until they were taken into combat in Korea.[66] [66] 1st Tank Bn Special Action Report (SAR), 7 Jul-29 Aug 50, in 1st Provisional Marine Brigade (Brig) SAR, 2 Aug-6 Sep 50. Support battalions were cut down to company size, generally speaking, for service with the Brigade. Thus Company A of the 1st Motor Transport Battalion numbered 6 officers and 107 men; and Company A of the 1st Engineer Battalion (reinf.) totaled 8 officers and 209 men.