What constitutes being "old school" in the military?

Time is relevant, things change to fast.
If you are the oldest Vet alive you are old school.

To me it means carrying on with all that the military taught you back in the day and applying it to your civilian life

Sorry we ate C-rations. In the field rode in a personal carrier m113a1. Loved the old helmet you cook sit on it, wash in it, cook in it, use it as a pillow. The rest I loved. I remember blood stripes. Grenade range, 50 cal range, 60 range, m-16 range. Lots of time in Germany, fighting the Russians. Boarder markers, A & B bags, alerts, riot duty, MOP gear, banging metal together. A air strip so small on the top of a mountain that you can stand on end and see the curve of the mountain top. PT running from the top of mountain to the gate at the bottom and back to the top. All good things were O.D. green.

Burning you know what. f-14,, A-6 intruders. rain showers, then using helmet holding mekong water before seabees came. M-14. Old wooden cot and poncho liner for bed , jungle boots,

"Old School"? Was your D.I. a member of the "brown shoe army"? Do you know what an M-1 thumb is, slept with your M1 in a fart sack in your 'shelter half' in the pouring rain just to find out the your half was not 'water-proof'; attended the 'school of the bayonet', had the privilege and honor of pulling K.P.; and If so, was it before or after the automatic potato peeler? Do you know what it means to 'break starch'? And here is the kicker. Do you understand what 'blood stripes' are?

Driving / 4 wheeling in a M151A2
Flying in an OH-58 to mermite chow
Heating up C Rations on the manifold of your jeep (ham and eggs, chopped, and then meld the can of cheese)
1SG's carrying a brass tiipped swagger stick
Referring to "Old-School" as "Brown Booters."

Having a psychotic, alcoholic, ‘Nam vet in the throes of PTSD as you drill sergeant.

I'm "old school" because I originally wore the green fatigues they Army had before BDUs. When I joined the guys who were "old school" were the guys who wore brown boots when they joined.

You are 'Old Corps" if you know what an "ONTOS" is!

If you wore tennis shoes in boot camp, yellow sweat shirt and slept in a quonset hut your close. Rifle qual was with an M14, iron sights. I didn't see an M16 until staging battalion. We had no "barracks" and had to rake the sand every morning. Let me know if I'm getting close?