This glitch actually isn't useful, it is just for fun and just for that.

So, let's begin:

Okay, on Afghan, right when you respawn at the very beginning of the round, go to the bunkers, go behind them and into the garden.
Then go on to the hut on your left side and go into the little bush right in front of it. Then just keep moving closer to the hut in the bush until "X" pop up shows. Now climb up it, and then jump at the same time. You will just go flying into the sky. Amazing work, I never tried it, but I saw it.

*Important Notice: U have to be a sniper in this match, or the glitch simply wont' work.
*Important Notice: This has to be be an online Team Deathmatch, or just like above, it simply won't work.
*Important Notice: Put Commando Pro on, or else you will die when you fall to the ground.

This glitch is very very hard to acomplish, but you can get anywhere if you use it properly.

Also, you should watch some videos if there is any, just in case you cannot do it properly. I never tried it, but I am sure I will when I install my MW2 again.
Thanks for reading.