What constitutes being "old school" in the military?

Hmmm..... old school .... like solid green fatigues or BDUs in front of a M113 command track that I led a 120MM mech mortor section from.... like that kind of old school?

If your Deuce gear wasn't a sword and a shield, you are not old school.

lol, while I will admit that it is subjective based on when YOU served, I would say that this pretty well sums it up, (I am a Gruntpa myself)

You wore starched Satines to formation and made Gunny feel so good he gave out the "96"

Old school is a line defined by what is new, whenever anything changes then the old way is old school. As an example: I am Not Old School with shining my boots (not possible with desert boots), but I am Old School with starching my ACU's like they are BDU's. (Lets not debate the should or shouldn't starch, I just meant it as an example.)

If you look at my picture, You will see my uniform, Berlin wall still up. lol

For the Navy, it’s having done several cruises

Wearing kakis, no women in basic training.

Yellow pt shorts and white t-shirts

Company runs wearing fatigues and your boots.

You ate C-rations.