500 Marines Will Begin Testing These New PT Uniforms this Summer About 500 Marines will test and evaluate newly designed physical training uniform, service officials announced on April 13, 2021. (U.S. Marine Corps/Facebook) 13 Apr 2021 The Marine Corps has awarded contracts to four companies to produce prototypes of new physical training uniforms that will be tested by a mix of personnel starting in July. About 500 Marines will test and evaluate the newly designed physical training uniform, service officials announced on Tuesday. The olive-colored shorts and T-shirts will be made from breathable materials and will feature black mesh side panels and reflective Marine Corps logos.