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1. The Military Occupational Skill (MOS) assigned to a Chemical Specialist. Called Seventy-four Delta in military lingo.
2. A glorified car washer in the US Army.
3. Someone with a lot of time on their hands.
4. The most likely person to survive a chemical attack, but the least likely to survive that long.
5. The occupational skill in the Army that requires one to know how to blow up self contained haz-mat suits, fill bottles of air, setup a shower, and scrub down another human being.
You need someone to sweep the company's office? get the 74D to do it, he's in his cage doing nothing.

I feel like such a 74 Delta washing this damn Humvee.

He's such a 74 Delta, all he does all day is play solitaire on his PC.
by Private First Class June 23, 2008
A glorified car washer.
Man, my vehicle is so dirty...instead of going to the car wash, I'll take it to the 74D.
by VonDutch Rudder April 28, 2010