Beginning Jan. 4, 2013, all non-deployed Marines and sailors assigned to Marine units, regardless of component, active or Reserve, will be required to wear the appropriate seasonal service uniform each Friday. The service B uniform, otherwise known as “bravos,” consists of a long-sleeve khaki shirt with a tie and trousers and is worn November through March. The service C uniform, popularly referred to as “charlies,” consists of a short-sleeve khaki shirt with trousers and is worn during daylight savings time.