UBACS texture does not quite match the pants texture, and there are several uniform variants that appeared in Arma 2 OA that are missing (notably the t-shirt, rolled sleeves, and SF variants) that could be accomplished by retexturing or combining existing uniforms (USMC Spec-ops and BAF t-shirt, for instance). Additionally, several uniforms in OA featured glvoes that are not present on any of the CUP uniforms
The USMC has just about all of their uniforms as well as the FROGs. BAF, too. And NAPA, And CHDKZ. In fact, just about everybody has nearly all or all of their uniform variants. Why not the US Army?