Answer: dav

AnswerCrossword Clue
DAVFrost or Letterman (abbr.)
DAV"Captain Underpants" creator Pilkey
DAVGrp. of former GIs
DAVRetired servicemen's grp.
DAVCaptain Underpants creator Pilkey
DAVMan's name: Abbr.
DAVVeterans' group.
DAVPsalmist: Abbr.
DAVVeterans' org.
DAVOrg. for some G.I.'s
DAVOrg. for certain ex-G.I.'s
DAVOrg. for war-wounded
DAV"Captain Underpants and the Perilous Plot of Professor Poopypants" author Pilkey