NAM

Set to 45 different clues across 57 published puzzles, most often "Platoon" setting — The New York Times, Sunday, 14 October 2007.

3 letters

Every clue on record, most used first

"Platoon" setting7 times
The New York Times — Sunday, 14 October 2007
"China Beach" setting2 times
The New York Times — Thursday, 15 October 2009
Where many vets served2 times
The New York Times — Sunday, 7 October 2007
'60s war site2 times
The New York Times — Monday, 7 May 2007
60's war zone, briefly2 times
The New York Times — Monday, 8 May 2006
Vet's memory, maybe2 times
The New York Times — Friday, 10 February 2006
60's service site2 times
The New York Times — Thursday, 22 September 1994
Ho Chi Minh Trail locale, for shortonce
The New York Times — Tuesday, 15 March 2011
Site of some '60s toursonce
The New York Times — Saturday, 8 January 2011
'60s-'70s 114-Across localeonce
The New York Times — Sunday, 5 December 2010
"Platoon" setting, for shortonce
The New York Times — Sunday, 23 May 2010
'60s-'70s service siteonce
The New York Times — Monday, 11 January 2010