MASH Co A-4 Knit Winter Cap. These are the type caps you see Paratroopers and AAF personal wearing in photos. This is the first time we have been able to get any of these in over three years.One size fits all. In AAF, a star is Air pilot crew, but must not forget Mechanics crew who support on the ground. In extreme cold winter at the Europe battle line, D-1 Jacket and A-4 Cap were supplied for protect them who worked for flying a fighter as B-17 and P-47 in best condition. Originally A-4 Cap was supplied for Ground Crew, however some Air pilot crew love to use this Cap.