The aircraft is an AT-6, yes... but I think these fellas are more likely to be flying cadets than ground crew,
as they're wearing flying overalls. (possibly A-4 type)
The code on the fuselage indicates that this could be Bainbridge Field in Georgia. As far as I know there is
no master list for Flying Training Command/Training Command and stateside airfield codes, but Bainbridge
is the only field I've come across which seems to fit the code of 'BB'.