1. log into Elite and go to your custom classes
2. click on any of your classes and go to the "camouflage" section
3. (i used classic camo for this) right click on any camo you already have unlocked and click "inspect elements"
4. once done that, change what i highlighted in this picture:

to this:

5. now, change the actual camouflage name to "Marine" by finding this:

to this:

(it should also change the name of the "Classic" camo on the pic but it still has its design.
6. once you've done that, just select the "Marine/Classic" camo and click "Select".
7. now go ahead and send it to the game and it should say success! (if not, elite might be bugging out (surprise, surprise) or you typed in something wrong)
8. now wait for a message in game to pop up about the classes (the message might now show up, this is a problem with elite but luckily i got it first try, so keep trying!)
9. enjoy!