Victory March is one of the four unused songs in Wolfenstein 3D (DOS). It is a full-length track, probably meant for mission music.
John Romero said that there wasn't a particular reason why this song was excluded from the game. However, if you look how the music is utilized, each background song is used in four times--only the secret levels don't follow this pattern. This track could have been written to fill one of the secret levels that used repeated music, but was just never assigned.
Wolfenstein 3D (DOS)
Victory March is track 26 in the game's data files, and the IMF meta tag title is "VICMARCH".
Wolfenstein 3D (GBA)
Like the others, this track is left unused in GBA version. Interestingly, they decided to port the tune left unused in original version, but also scrapped it.
Possibly it was meant for level BGM, because the Game Boy Advance port lost some actual level tracks. Maybe, they wanted to replace one of them with Victory March.
The conversion is slighty faster than MS-DOS version.