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You can get waivered for all three promotions, if you merit it. Waivers for E2 and E3 are a bit unlikely, though, as the promotions are automatic after a relatively short period of time.
Yes , automatic or manual transmissions
Not to support the US Army Rangers.
Payments from the government
Curerently, Rangers must be jump qualed. There are no leg Rangers anymore, only Airborne Rangers.
Yes, you can.
The Army Rangers are an elite regiment of Infantry, trained in more specialised roles than standard line infantry are.
automatic or manual transmission
For lower enlisted, yes, as those are automatic promotions based on time in service. So, if you're a Specialist or lower, you shouldn't lose rank. If you're going to the Regular Army from the Army Reserve as an NCO, you should expect that you'll loose at least one rank/grade.
Rangers get taught great hand to hand combat.
The American team in Modern Warfare 2 is the United States Army Rangers, simply called Rangers in the game.
One can find out on how to become an Army Ranger by simply applying to defend one's country as a Army Ranger. One will find that not only the United Statses of America have Army Rangers, but also Canada and parts of Irish Millitary Defence Units share the name of Army Rangers.