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Adjective that defines an Army soldier who, in either combat or casual settings: keeps perfect uniforms far above required standards, with no loose threads or stains or wrinkles, and all required insignia and medals exactly where they should be; and, has superb dignity and bearing, ramrod straight yet behaving with the ease born of confidence--in short, the model of appearance for all soldiers to follow.

The term was heard by this writer in 1977-1978 at Fort Bragg, NC, post-Vietnam era. It was considered the highest compliment that could be paid by one soldier to another. It was always given to male soldiers, as female soldiers were so few at the time and it tended to be a "guy thing." It might derive from one of a number of related words in old German, Dutch, or English meaning "tight," "tense," or "strict" (see "strak" in Wiktionary-dot-org).
"Listen up! Look at Sergeant Cooper here. This is the living, breathing definition of strack. Not a hair out of place, clean shaven, pressed uniform, boots so shined you could shave using them as mirrors. I want every one of you men to look exactly like him in formation tomorrow morning! Anyone who doesn't is going to do the Dying Cockroach until sundown! Do you hear me?"

"Man, you are strack!" "Hey, thanks."
strack by theangstguy March 24, 2014
Related Words
Streacle; the feeling where you balls stick to the inside of your leg. It could be because of sweat or tight trousers
Tom: it's so warm in here
Dean: I know, I have proper bad streacle
Streacle by Charlie Hatfoonijkuh January 19, 2013

Dr. Strack 

Dr. Strack is a man whose life turned upside down ever since he left his job as a chemistry teacher, since then he has been trying to live life to its fullest by picking fights with burley fellows, paragliding attached to his wife's car, doing quadflips off buildings, and other stupid crazy stuff, etc.
That sounds like something Dr. Strack would do... what a fag.
A 1970's era US military acronym, meaning: Strategic, Tough, and Ready Around the Clock. To be labeled "strac" was considered high praise.
"He was a strac trooper."
STRAC by DJ Asman December 23, 2004

stracciatoni 

A pizza topping that's common everywhere except Domino's.
Give me a large pizza with half stracciatoni and half bandoli, please.
US Army slang commonly used during the Vietnam War; it probably originated during World War II and stands for STRictly ACcording (to regulations). It was an epithet applied to officers and NCOs who 'go by the book' and seem totally unable to think for themselves. It describes the military equivalent of a Jobsworth, frequently linked with REMF.
"That STRAC REMF insists on a formal parade before we go out into the boonies to hunt Charlie."
STRAC by AKACroatalin November 6, 2016