The Rat Bastards #1: Hit the Beach!:

They love to fight and live to kill! Start with an insane sergeant with a genius for leadership and a lust for blood. Add a bank robber. A racketeer. A guy who goes berserk on the battlefield. A gun-happy Texan. A silent Apache. A movie stuntman who swings from trees. Put them all together and you have the killing machine known as The Rat Bastards. First in the gung-ho 16-book action series by Len Levinson (writing as John Mackie). Produced under license from Len Levinson Media.