What constitutes being "old school" in the military?

USMC style. M-14, C-Rats made in 1945, canvas 782 gear. Khaki uniforms, sateen utilities, starched covers, running the PFT in boots and utes. The old PRT, mess kits, Brasso, M-Nu, Kiwi shoe polish. Calling the First Sergeant "Top", calling female Marines "WMs". Fellow Marines were Splibs, Pork Chops and Chucks, no offense ever intended. Liberty Cards, no POVs for below Corporal. Cigarette issue at boot camp, and in every c-rat. Smoking indoors. Seeing your buddy's name listed in the Navy Times. 106 Recoilless Rifle, Flamethrower, 3.5" rocket launcher. But a lot of my current buddies think I'm a boot.

Bell Botton denim dungarees, enough said.

Chasing submarines in a H-2 with the doors open, wind in your face using a primitive lit screen and a grease pencil to indicate the sonobouys and guess where the sub is, hoping for a Madman (magnetic annomolly detector) hit. The good old cold war, 15 miles of the Soviet coastline. Then landing on the tiny deck of a fast frigate: those were the old school good old days!

Know What a steel pot is! Lol

Our PT uniform shirts in DLI had the caption "We're learning Russian, so you won't have to." Graphic of a ghost wearing a Russian winter hat with the title "Sovbusters" above the graphic.

If you know what a P-38 is and how to use it

I "broke starch" with an M-14 bayonet on my cotton khaki uniform trousers before switching to TWs. The shirt with my greens was brown.

PT Shorts ?? We had combat boots and rifles (Garand) helmets and running in the sand road beside the San Diego airport runways

I'm so old I wore jungle cammo to a desert war

Flying Huey's, Cobra's, and Kiowa's.
P38 can opener.
Black Army Combat Boots
Ugly green Class A's
Tan Class B's
C Rations with cigarettes (got these as a boy scout in 1969 in Italy)