Salute is one of the four unused songs in Wolfenstein 3D (DOS). It's a short fanfare, probably meant for an intermission or end of level music, though it's much slower than the song that was actually used.
John Romero said that there wasn't a particular reason why this song was excluded from the game. However, it seems superfluous since there is already music for the end of a mission and episode.
But this song found popularity in some games published later.
The song is quite simple; it plays at about 90 beats per minute, is in the 4/4 time signature with a swing element, and plays in the key of D minor. It is lead by a lead trumpet, accompanied by harmonizing trumpets that play the main chords of the song (Dm, C, B♭, Asus4, and A). A timpani playing a D note accompanies the song as well. However, during the Asus4 - A outro, it is pitched to A.
Wolfenstein 3D (DOS)
Salute is track 11 in the game's data files, and the IMF meta tag title is "SALUTE".
Wolfenstein 3D (GBA)
In this game Salute was left unused, just as any other track. Intrestingly, they decided to add track usused in original version, but also scrapped it.
Unlike the previous two games, this version doesn't loop. It appears when you are getting an achievement.
The in-game name is "salute.ogg".