What constitutes being "old school" in the military?

Old school ended when they banned topless waitresses, liquid lunches and slot machines at Ft Knox.

According to that definition I don't know if I'm old school or just old. When I was in there were no pt shorts or banana suits, whatever that us, we fell out for pt and classes in fatigues (not even called bdus in my day), and in the field we ate know rations instead of mres.

This

Yellow nylon pt shorts?? How about black combat boots and fatigues for PT??

Along with the other great comments:
C Rats...burning the box to heat up the main course.
1st issued rifle said

The silhouettes on the rifle range bore a Red Star to represent the Soviet enemy

Your Drill Sergeants were Vietnam Veterans.

Your Drill Sergeant told you that the M16 was designed by Mattel

You sang dirty cadence while you marched, and liked it.

You wore O.D. fatigues and black boots

Drill Sergeants could still scream and smack a Private when necessary without the threat of an ACLU lawsuit

You got the “suicide speech” about not trying to hang yourself with the buffer cord because if you put the cord around your neck and threw the buffer out the 3rd story window, the buffer would hit the ground before the cord ran out.

You used lister bags in the field

You had a mess kit

You had a fanny pack on the back of your web gear

You wore a steel pot

You ate C-Rats, with issued cigarettes.

You had a P38

You used a 'donkey dick'

You had a 'dream sheet'

You know what a "short-timer's tree" is.

You rode in a 'cattle car'.

Payday involved reporting for pay in Dress Greens, going through uniform, TA-50, wall locker, and common area inspections before you could stand in line at the post bank to cash your check.

There were 4 clubs on Post: Enlisted, NCO, Top 3, and Officer. You had to purchase a monthly club card for admittance and the club system was run by military personnel.

Never ever saw a yellow suit we wore black combat boots, OD green fatigues,white t-shirts

Not seeing Maternity BDU at Clothing Sales, wore black boots for PT and anyone in Tennis shoes was considered “broke dick”!! I used the same black boots for PT for all 21 yrs. had them resoled 5 times!! Most comfortable shoes I ever jad!

PT uniform consisted of boots, fatigue pants and a white tee shirt.
All to go along with the 5 event pt test.

Lyster bags

Going being the barracks to resolve an argument with your fists

Being told by your platoon sergeant that he can’t “legally tell you to break the cast off your broken fingers” because it keeps you from getting a good grip on your weapon while you get out of the helicopter

Breaking the cast off your broken fingers because it keeps you from getting a good grip on your weapon while you get out of the helicopter.

Everything everyone else said