Pete and Randy reignite their intense rivalry—and end up competing for Jill's affections—when they take part in Cody's Army Ranger trials. Meanwhile, Derrick tries to act more macho after meeting Erin's manly ex.
Pete's hidden weakness is revealed in the midst of a prank war with Jill's platoon. While Derrick and Randy work to help their big brother maintain his unit's respect, Cody turns being deskbound into an opportunity to dust off some old solider skills.
The members of Pete's platoon are tricked into being crash-test dummies for 2nd Lt. Tyson Schneeberger's experimental automobile; at the same time, Derrick is assigned what turns out to be the difficult task of taking Sgt. Maj. Cody's portrait.
Jill helps Pete through a breakup after a woman he neglected to call it quits with before being deployed to Afghanistan reenters his life. Meanwhile, Derrick and Randy test the dating waters without each other as wingmen, and come to some startling revelations.
Randy helps plan a deployed father's reunion with his son after Derrick promises to bring the soldier home to impress the boy's mom; at the same time, Pete and Jill put their differences aside for the common goal of beating the Marines at flag football.
Derrick helps a dejected Randy develop a new mindset in order to pass his marksmanship test, while Pete and Jill set out to determine who's the better soldier by competing in a series of unorthodox challenges.