Musical Allusions 2 by AlexanderD

Question 4

Are you a bad enough dude to answer this question? Referencing the game's main objective, what public-domain song is alluded in the ending of "Bad Dudes vs. Dragon Ninja"?

HINT: the arcade version, released in 1988, had a different ending than the NES version, released in 1989. An important event between the two games necessitated the change.

"Hail to the Chief"