a combat vehicle restraint system accommodates a wide range of soldiers , both with and without battle , arctic , or chemical gear . the restraint system includes lengthened belts and an adjustable buckle position . the belts include loops for locating and grasping the belts , and separate lap and shoulder belts with small narrowing ends to prevent catching on gear . the belts are extendable from inertial reels which are calibrated for off - road operation . the buckle engages each belt separately and includes a single action release . the buckle position is easily adjusted using an oversized knob so that a soldier may easily find and adjust buckle length in the dark , wearing heavy gloves , or with muddy slippery fingers . the latch / unlatch mechanism and associated hardware is an open frame type to reduce or eliminate affects of mud , dust , water or other contaminants on operation .