I understand what you mean, I used to think that way, but its
not really due to their appoinments in the Military,
directly.
Several factors I think contribute - firstly, A level students who
are officers or specs are usually awaiting a uni placement. And the
selection from BMT to OCS, the PC or OC actually recommends the
more "on the ball" ones. And being on the ball does help in your
professional life in some way. its just one example. There are
other factors but similar to poly students as well.
And those in who went thru OCS, if they paid attention, they would
have actually learned something positive from the whole 9 mths they
were there. I'm not an officer, but I have seen some of the course
content.
But there are officers/specs who are bums as well, or don't make it
big. But going thru OCS or SISPEC does build some character in some
of them.