FBI HRT or SWAT? How to become one?

I really want to get into the military and possibly make a career out of it, but have a plan B if I don't want to. After a few years in te military (let's say rangers) how would I apply to become one of those? And also what is the difference between the 2? What kind of missions do they do? How often are... show more I really want to get into the military and possibly make a career out of it, but have a plan B if I don't want to. After a few years in te military (let's say rangers) how would I apply to become one of those? And also what is the difference between the 2? What kind of missions do they do? How often are they used? Who is used more?
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