Before any service member deploys, they have to visit the supply depot on their station. Now, these supply depots issue out a bunch of items. But for the most part, they're worn down and look like something a homeless guy would reject.

The fact is — you're not the first guy or gal to take a nap in that sleeping bag or to load rounds into that M16 magazine. It's been well used before you even thought about touching it.

Related: 8 things Marines like to carry other than their weapon

After seeing the state of some of this gear, service members typically think about the months of deployment time that lies ahead and remind themselves how much stuff the military doesn't voluntarily distribute.

So check out our list of things you may want to consider buying before going wheels up.

1. Bungee Cords

Like 550 cord, these elastic straps are strong as Hell and will secure down nearly everything.

2. Blow up sleeping pad

Traditionally, supply issues you a ratty foam mat which is like sleeping in a really cheap motel room.

3. Headlamp

Getting issued a flashlight that's designed to clip to your uniform (which is what you'll get) is fine if you're okay with tripping over everything in the pitch black (because it doesn't point to where you're looking).

4. Rite in the rain

Normal paper isn't meant to repel water. You never know when you need to take notes in the field while it's pouring down rain. "Rite in the Rain" is waterproof paper you can still jot notes on.

5. P-Mags

The 30 round magazine that the supply guy handed out has seen better days and has a single compression spring built inside which can increase the chances of your weapon system jamming when you need it the most. The polymer version made by Magpul is much better — so good, in fact, the Marine Corps is issuing it to all Leathernecks.

Also Read: 7 things you should know before joining the infantry

6. GPS

People get lost if they spin around one too many times, and most people simply suck at land-nav. Consider purchasing a G.P.S. that fits snuggly on your wrist.

7. Cooler eye-pro

The military does issue eye protection that has frag resistant lenses, but they don't make you look cool. Everyone buys sunglasses before a deployment that make you look tough — its an unwritten rule.

8. Knife/multitool

This should be self-explanatory. If you want to open up just about anything and your Judo chop won't cut it.