Pretty funny. Today I was checking out Gunforce 2 which was made by Irem in 1994. Instantly I noticed the music was very familiar. Then I noticed the sound effects! These are almost identical to the Metal Slug sounds! Rescuing female hostages, driveable vehicles, and battle assessment just like Metal Slug. Maybe it's the same development team, but its pretty funny to know all the metal slug stuff was lifted from this game.