Mention has been made of "The Foreskin Fusiliers".
The version I know ran along the lines:

"Eyes Right, Foreskins tight, ballocks to the front
"We're the boys who make the noise and we're always after c--t,
"We're the terrors of the night
"And we'd rather f--k than fight
"We're the heroes of The Foreskin Fusiliers"

Presumably any unit name which scanned could be substituted

W