People fresh from OCS tend to have a different idea of what consitutes a regulation haircut.
I will say (having been in ROTC and OCS) that the OCS guys tend to come in more in shape, squared away with respect to uniforms , and just overall demeanor than their colleagues from the other commissioning sources.
If people want to be honest they will generally agree....of course there are outliers in all examples. I think it is because we are still drones from the previous 12 weeks of suck.