Let's make one thing crystal clear, no member of the US military contributes in any way whatsoever to protecting the freedoms of the American people. As a matter of fact, they are more likely to turn their weapons on you than they are to defend your Constitutional rights.
The only people on this planet Earth who can affect your freedom are members of Congress, local legislators and the members of enforcement institutions who will blindly follow the rulers who sign their paychecks. And, while your beloved troops are murdering people around the globe, yes, I said murdering, your Congress and local legislators are eliminating your freedoms, en masse, without any intervention by our so-called protectors in the armed forces.
To understand the REAL mission of the US military, and the real impact the US has on DESTROYING democracy and freedom around the world...listen to this confession of a US economic hit man...link. There is no honor in volunteering to go anywhere in the world and kill anybody you are told to, without question, without historical background and without verifying the stated reasons for doing so.
In this modern age of information we now know that time and time again our military have been deployed into battle, to kill and be killed, for reasons that in no way shape or form resemble the reasons for which they, or we were told at the time. This is no secret, although many Americans refuse to take off the flag that is wrapped around their eyes and see American history as it really happened. They blindly believe what was told to them by the people who have a vested interest in maintaining myths and misconceptions.