MUSTANG Custom Flex-Fit hat. (Navy Blue or White) Select your path to commission (LDO, CWO, OCS, STA-21 and if you are lucky enough select RETIRED) Hats are Flex Fit and come in S/M (6 3/4 - 7 1/4 hat size) and L/XL (7 1/8 - 7 5/8 hat size)