Answer:

raf

Answer	Crossword Clue
RAF	Britain flyers
RAF	WWII group
RAF	Churchill's "so few"

RAF	Churchill's "so few": Abbr.
RAF	Royal Air Force; abbr
RAF	UK defenders
RAF	UK mil. branch
RAF	Allied WWII fliers, for short
RAF	Flying fleet of the U.K.
RAF	Their motto is "Through Adversity to the Stars": Abbr.
RAF	Fliers with the Ministry of Defence: Abbr.

RAF	Blitz opponent (abbr.)
RAF	U.K. defenders
RAF	UK flyers
RAF	Brit fliers in WWII
RAF	U.K. fliers
RAF	Luftwaffe foe
RAF	U.K. flyers
RAF	Battle of Britain grp.

RAF	"Luftwaffe" foe (abbr.)
RAF	British mil. group
RAF	Brit. flyboys
RAF	Defence gp.
RAF	Org. with squadrons of Spitfires
RAF	"A Yank in the ..." (1941 war film)
RAF	U.K. military branch
RAF	Spitfire flying gp.

RAF	Brit. fliers
RAF	Luftwaffe foe, briefly
RAF	Org. Roald Dahl joined in 1939
RAF	Spitfire fliers, briefly
RAF	WWII fleet
RAF	Brit. flying group
RAF	Spitfire fliers: Abbr.
RAF	UK defense arm

RAF	UK defense gp.
RAF	Prince Charles served in it: Abbr.
RAF	UK fliers
RAF	WWII fliers
RAF	"A Yank in the ..": 1941 war film