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Without groundcrews that aircraft is not leaving the ground.
I go with the Luftwaffe for ground crews is because it simply was amazing what they had to do to keep those aircraft in the air in the later parts of the war.
Trying to taxi though glutonous mud on the strip after heavy rainfalls and monsoon weather conditions and ground crews trying to keep the aircraft moving and not getting bogged down and working under tropical condtions to keep the aircraft airworthy.
Can you imagine the black flies in summer Russia
I know I'd much prefer to work in the heat and humidity or just plain heat. I work outside and don't use gloves on cold days and at the end of the day when my fingers are cracked and bleeding from the cold I pine for a an average summer day of 30c day with humidity. But still no matter what theatre these guys of all forces performed miracles with limited resources