DFCS

Set to 3 different clues across 3 published puzzles, most often “R.A.F. awards” — The New York Times, Wednesday, 1 June 2011.

4 letters

Every clue on record, most used first

R.A.F. awardsonce
The New York Times — Wednesday, 1 June 2011
Gallantry-in-war medals: Abbr.once
The New York Times — Sunday, 16 November 2008
U.S.A.F. awardsonce
The New York Times — Sunday, 13 March 1994