Don't waste your life away by making yourself a pawn of the military industrial complex/crooked politicians and their greedy goals.
If you want to help people serve your country by serving inside it. There's tons of things you can do. Going abroad and doing the dirty work of some cowards in the oval offices serving THEIR puppet lobby masters is not helping anyone. If you're going there to make money because you don't know how to make money, then I feel sorry for you, but far more sorry for the people abroad that will suffer from your actions.
As far as steroids go, at least here in canada, most law enforcement agencies do testing here n there, especially when you're just getting in, however it is pretty widespread amongst gta (greater toronto area) cops...
I know this may 'shock' some but believe it or not during high school I had the desire to go to the Canadian royal military college to become a pilot. However as I learned more about the world, politics, etc... I would never join the army except if our families are being attacked unjustly on our own soil here. Western armies have become nothing but imperialist trash tools of the elite scumbags of humanity. Deluding the people and abusing the people, ultimately leading the whole world into suffering. The US has f'ed itself but far more sadly f'ed the whole world more and more. Is oil cheaper? No. Is food cheaper? No. Everything is sky rocketting, the US is going bankrupt, other countries in ruins. Etc... Blinded by greed!
The people claiming to be 'bringing peace' to the world are the very ones actually bringing havoc to the whole world. The world is worse and worse day by day, in every way you look at it. So my advice, don't waste your life away for a lost and wrong cause even if you're 21 and idealistic spoon fed all the 'valor', and 'honor', and whatever else some military rep or family member or whoever including yourself tried to imprint in your mind.