What's your best shamming tactic?

As a mechanic, my best sham was just three words: "That's operator level."

I had a Marine that would sleep inside of cabinets and lockers. I became good at finding skaters. I myself was in charge of to much stuff. But occasionally i used that to skate and i would relax in a humv trailer up at the motorpool or behind the barrels of aviation fuel that i was in charge of counting. I would make excuses for my roommates as junior Marine like they have explosive diarrhea and cant show up for formations. Good times.

Best shamming tactic in the Navy on ship is to carry a tag out sheet with red tags, wander around like you are looking for someone the sign it.

Getting up in the belly of an Apache and napping, although some of my friends preferred sleeping in the catwalk

I worked my ass off in bootcamp and made E2 at graduation. Then I worked my ass off in MCT and MOS School and was promoted to E3. I worked my ass off as an E3 and was assigned to an E6 billet . . . my work is done here . . . I'm an E3 receiving the full respect as if I were an NCO. E4 was pinned on after that no questions asked. Unfortunately, I got severely injured during a training exercise while an E2 and didn't know it, got cut open, parts installed, and was cut loose a day before I pinned on E5. One of the saddest days of my life.

First, find something really cool or fun. Figure out some part of it that requires doing on a regular basis, but on your own schedule. Whenever someone comes by with their work, 'sorry sir, the space shuttle door guns need test firing again'.

Infantry: I'd tell the squad leaders, me and the rest of the team are going out into the wood line to practice our movement and concealment techniques. Once in the woods we'd set up shop under a tree, and we'd nap.

I was the Battalion Ammunition NCO. I was always at the AHA sleeping

Be in involved with many programs. Navy AT here and I was an awful AT; just didn't have the skills for that sort of electrical work. So I started to make myself useful in other ways; shop/building/over-all qualifications & many side-activities and programs. So much of the time I really did have other places to be, but I could use that to do what I wanted as well; everyone assumed I was with someone else. The key to good shamming is having actual work at the center of it.
I can't write this without mentioning the most outrageous of the guys I worked with: he was loaned out to another shop for a while and when he came back he somehow convinced both Days and Nights he worked the other shift. He' come in right before Night shift came in and left a little after Day shift. When he got caught, he barely got in trouble for 1) the sheer audacity of it and 2) it would look very bad on our shop for not catching it sooner so it stayed internal.

I became a medic and went to an infantry batt, enough said