Could be done military style:"Fighters,Foo,F_________.
From Wikipedia (edited for TB):
The
nonsense word "
foo" emerged in popular culture during the early 1930s, first being used by cartoonist
Bill Holman, who peppered his
Smokey Stover[3] fireman cartoon strips with "foo" signs and puns.
[4][5][6]
The term "foo" was borrowed from Bill Holman's
Smokey Stover by a radar operator in the 415th Night Fighter Squadron, Donald J. Meiers, who (it is agreed by most 415th members) gave the foo fighters their name. Meiers was from Chicago and was an avid reader of Bill Holman's strip, which was run daily in the
Chicago Tribune. Smokey Stover's catch-phrase was "where there's foo, there's fire". In a mission debriefing on the evening November 27, 1944, Fritz Ringwald, the unit's S-2 Intelligence Officer, stated that Meiers and Ed Schleuter had sighted a red ball of fire that appeared to chase them through a variety of high-speed maneuvers. Fritz said that Meiers was extremely agitated and had a copy of the comic strip tucked in his back pocket. He pulled it out and slammed it down on Fritz's desk and said "... it was another one of those ****in' foo fighters!" and stormed out of the debriefing room.
[7]
According to Fritz Ringwald, because of the lack of a better name, it stuck. And this was originally what the men of the 415th started calling these incidents: "****in' foo fighters". In December 1944, a press correspondent from the
Associated Press in Paris, Bob Wilson, was sent to the 415th at their base outside of
Dijon, France to investigate this story.
[8] It was at this time that the term was cleaned up to just "foo fighters". The squadron commander, Capt. Harold Augsperger, also decided to sanitize the term to "foo fighters" in the historical data of the squadron.
[7]