First crewman is wearing the RAF Type B flight helmet (famously used during the Battle of Britain), the second crewman is wearing a USAAF B-6 type shearling helmet. The mask is an early A8-B type used by bomber crews mostly from before the war up to about 1943 when it was phased out by more modern systems. The A-8B was a constant flow oxygen mask, patterned after the original design by Boothby, Lovelace, and Bulbillion (the mask was originally known as the BLB mask). It covered the mouth and nose and also had a rebreather bag attached to concentrate the oxygen for enrichment.
Both crewmen wear the famous B-3 type shearling jacket. Aviators in WWII bombers came to rely on their B-3 jackets as they often flew for 8-9 hours in unpressurized cabins, where air temperatures could drop to more than 60 degrees below zero (-53 Celsius). The bomber was vital to the crew’s comfort as the crimp of the sheep’s wool created insulating air spaces, naturally retaining heat and absorbing excess moisture generated by the body. It remains one of the warmest and most insulating bomber jacket ever made. Both crewmen also are sporting RAF type MK VII goggles with flip down sun visors.
The use of RAF equipment was common among aircrew, especially early in the war due to either shortages or inadequacies of the issued gear. Fighter pilots especially favored RAF helmets, oxygen masks, and life preservers due to how much more comfortable they were.
(Photo credit: Margaret Bourke White / LIFE Magazine).