Quick note for those that are just now getting their comissioning uniforms - You CAN'T deduct the cost of the following: Dress Blue Blouse, Trousers, White Shirt, White Trousers, Service Alpha Blouse, Trousers, Khaki Short Sleeve, Khaki Long Sleeve, Khaki Ties, Corframs, Covers, Rank Insignia, Ribbons, Badges, Collar Devices, and socks.
You CAN however, deduct the following: Cammies, Boots, Cammie Covers and Medals (if you have one anodized, they all have to be - may have to suck up the cost of the first one, gets kinda shady at that point), medal mounting services, tailoring, and sword.
Don't forget to add in off-duty education (get some money back from what TA and GI won't cover), CFC arm-twisting, Navy/Marine Corps Relief arm-twisting, Wardroom (or Officer) dues, per-head Mandatory fun parties, Marine Corps Ball Tickets, Vehicle Property Tax (as long as everyone in the state doesn't pay the same amount, and your tax is not based on the weight of the vehicle), Hotels during a PCS (USMC won't reimburse those, and those are deductible), and hands-free headset (required for on-base, and if you're on duty you must have a cell phone).
However, and most importantly - don't forget YOUR HOUSE, and if you don't have one - use the standard deduction. The pain of itemizing is not worth your time. Guess who just finished his taxes?!? I'm amazed that when it was all said and done, that my taxable income was $7800 (blame it on 7 months in Iraq), and my taxes were still $540. If I was LIVING on $7800, $540 would HURT! Luckily, I get back $2300 and some change (because I already gave them $2900)...