What constitutes being "old school" in the military?

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
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.

Dad (holding trophy) was old school. This is the foundation of his 37 year military career, his high school ROTC rifle team. Photo taken in 1929 when they won the Hearst Shield in national competition.

Old School for me: Manual type writer, M16A1's, 20 round mags, working with a tactical missile computer that had dials on it (Lance) that was obsolete as my high school calculator had more useable functions than that did. Elevating said missile manually (lance had no hydraulics). Going to the range and being able to zero and qualify a unit in a couple of hours. Going to range where everyone one could zero on set. Getting issued wool pants for field gear, and never use them in the field. Micky mouse boots, old school NBC boots you had to lace up, M13 Decon kit. Blood Agent Antidote kit, the tube for an M17 mask to perform buddy resuscitation on. Wondering why you get issued BDU's but every time you go to the field it is in MOPP Level 2. Making Pop corn in a steel pot, shaving in said steel pot, boiling water for instant coffee in the same steel pot. Learning to not roll over a Jeep. Wishing that the Army had the common sense to put fracking heaters in Jeeps. Trying to figure out how the guy with the Multifuel truck runs out of fuel. You could put almost anything in it, and it would run, how do you run out?

Olive drab uniforms, hard toe boots, bkack spit-shined, M-1 rifles, double full platoon bay. double bunk. WW two barracks you could see between the boards on the sunny side of the building. Coal heated barracks. The black crap you blew our of your nose every morning was coal dust. Jeeps (could not be sold now as too dangerous. M-113s, the old version. Smoke em if you got um. Kp..
Fire duty keeping the buildings warm (not) but the water was hot if your were early....maybe more later....have to rest my OLD OLD mond. Army 61-66. Army security Agency. done away with after Vietnam.

You might be old school if you ...
*Had jungle boots that started out green and black and then were issued new ones that were black on black (1987, 1991)
* know tricks to fix your uniform like - sharpie to fix shiny metal into subdued.
* carried iodine tablets and know how many to use for your self or a lyster bag
* know what a lyster bag is
* know that a lensatic compass and map was not the 'back-up' to GPS
* cheap frequency hopping was switching between A and B bands on a PRC-77
* you know the difference between an OE-254 and RC-292
* you still ate green eggs and ham in a can with P-51 or P-38
* you ate green eggs served out of a silver bullet
* you know the three meanings of 'Silver Bullet' (Rectal Thermometer, shot in the buttocks, the metal containers in a mermite box.
* know that TACJAM is not something you put on toast and will stop future generations

Sp5 G Smith

Dropping your fatigue shirt for morning PT before breakfast.
Half day Saturdays for barracks inspection or BN inspection by the BN CO.
Boots spit polished.
Steel pots and helmet liners.
C-Rats while in the field. Cold C-Rats when there’s no hot water or light discipline at night.
Shelter-halves.
Metal canteens.
Metal mess kit.
Wooden handle entrenching tool.
Mess Hall.
KP. (Pots and Pans)
Pistol belt with the old hook clasp.
PRC-25s

Probably not getting on the Internet and asking what constitutes old school.

We ran every morning in combat boots and fatigues.

-Using rotary dial pay phones to call home.
-Standing around open fire burn pits or barrels to keep warm in the snow.
-Willys MB style Jeeps were still the norm.
-Cattle car transports.
-Huey helicopters were still the norm.
-Wearing M1 steel-pot helmets.
-Becoming a whiz at unjamming M60 GPMG.
-"OG" green fatigues were still official uniform wear.
-Camouflage BDUs when they were issued for the very first time.
-Army green Class "A" uniform.
-Starched uniforms were still a thing.
-All-Purpose Lightweight Individual Carrying Equipment (ALICE) and large field pack with frame.
-M17A2 protective mask.
-M16A1 standard issue rifle.
-No computers or cell phones.
-$0.15 postage stamps.
-Shelter halves.

Generally it seemed to me that anyone that was in at least five years or more before you joined were called "old school." I remember having drill instructors that were already in five to six years or more when I was in boot camp and they were said to be, "Old Corps - Hard Corps." Many years after I had completed my four years of active duty I was talking to a guy who went in five years after me had also completed his enlistment. When I told him my enlistment dates he said, "Oh, you are from the Old Corps - Hard Corps!" I never thought about it until he said that.

Slightly off the subject but my students sometimes ask other teachers (teachers much younger than me) why Mr. Burk is so strict in his classroom? Their response is always, Mr. Burk is old school.