What's the last song that the Expendables team members sing?

Just back from seeing The Expendables 2 and was wondering what the last song the Expendables team sang at the end was.

These are the lyrics of the team hymn:

Beware, Beware, Walk With Care

Careful what You Do

Or Mumbo Jumbo's Gonna Hoodoo You,

Mumbo Jumbo Is Gonna Hoodoo You,

Boomlay, Boomlay, Boomlay, Boom!

It's a military cadence based on the 1912 Vachel Lindsay poem "The Congo" (available here).