Why do you say it isnt a navy crew, and those arent navy uniforms? Not in the USN so not able to tell quickly, but it seems that they are in a mix of the USN NWA Type IIIs, Navy Whites, and then working overalls. They almost all seem to have some sort of rank insignia, though the only ones I can make out are the LT, the CDR or possibly CAPT, and then maybe a cadet to his left?