You can join IVAW
Army Regulation 600‑20 paragraph 5‑2 b authorizes soldiers, including national guard and reserve, to participate in local nonpartisan political activities. IVAW is local and does not participate in partisan political activities. But soldiers are not authorized to: (1) Wear a military uniform or use any government property. (2) Allow participation in IVAW to interfere with, or prejudice, military duties. (3) Imply that the Army has taken an official position on, or is otherwise involved in, the local political campaign or issue. Not in the Army? Check out http://www.veteransforpeace.org/files/pdf/GI%20Rights_Updated2009.pdf.

You have the right to attend peaceful demonstrations on your time
This right is explained in Department of Defense (DoD) Directive 1325.6.

You have the right to say & write (mostly) what you think
But there are some limits here. You can't call the President, Dick Cheney, Donald Rumsfeld, or other high government officials what article 88 of the UCMJ calls “contemptuous words” like “fascist,” “thief,” murderer,” “tyrant,” “fool,” and “gangster.” You can, subject to these and other limitations, write, publish, and distribute things like newspapers, leaflets, and web pages. It all has to be while you’re off duty and without using military paper, ink, computers, phones, or other supplies or equipment. See Army Regulation 600-20 Appendix B for further explanation. Not in the Army? Check out www.veteransforpeace.org/GIRights.pdf.

When your command ignores the rules
You don't have to be in the military long to find out that commands sometimes ignore the rules. There are several ways to challenge this sort of thing. Let your fellow troops know the deal. Keeping quiet and hoping your chain of command will listen to reason usually doesn't work. They have their ways to mess with soldiers-informal harassment from superiors, poor performance evaluations, bad recommendations, and bogus disciplinary charges. But you can find ways to mess with them too. We don’t have to tell you how. But let your comrades know your situation. Show your friends that you don't deserve the bad treatment and that your protest activities were the real reason the command developed an attitude and took action against you. Form a network of support around you for whatever actions you take. The other thing you can do is get support from organizations like IVAW, Veterans for Peace, Military Families Speak Out, or Gold Star Families for Peace. It always helps to have organizations that can mobilize people or media to back you up. Finally, you can complain through the IG, the chain of command, or get some legal assistance through a military counselor and/or an attorney who's familiar with military law.

Use it or lose it
Some advance preparation is the best way to use these rights; knowledge is power. And using your rights is important for you, for others caught in a bad war, and for all of us.

For more on GI rights
Check out www.veteransforpeace.org/GIRights.pdf and check the regs cited in that leaflet.