Not that it is shocking anymore when Bush disobeys the rules, but he used troops as props during a politcal press conference today during which he attacked Democrats.

According to DoD Regulations:

Regarding active duty troops

It is DoD policy that:

3.1. The wearing of the uniform by members of the Armed Forces (including retired members and members of Reserve components) is prohibited under any of the following circumstances:

3.1.1. At any meeting or demonstration that is a function of, or sponsored by an organization, association, movement, group, or combination of persons that the Attorney General of the United States has designated, under Executive Order 10450 as amended (reference (c)), as totalitarian, fascist, communist, or subversive, or as having adopted a policy of advocating or approving the commission of acts of force or violence to deny others their rights under the Constitution of the United States, or as seeking to alter the form of Government of the United States by unconstitutional means.

3.1.2. During or in connection with furthering political activities, private employment or commercial interests, when an inference of official sponsorship for the activity or interest may be drawn.

3.1.3. Except when authorized by the approval authorities in subparagraph 4.1.1., when participating in activities such as unofficial public speeches, interviews, picket lines, marches, rallies or any public demonstration, which may imply Service sanction of the cause for which the demonstration or activity is conducted.

And regarding retired vets:

3.2. Former members of the Armed Forces, unless under another provision of this Instruction or
under the terms of Section 772 of title 10, United States Code (reference (d)), who served honorably during a declared or undeclared war and whose most recent service was terminated under honorable conditions may wear the uniform in the highest grade held during such war service only on the following occasions and in the course of travel incident thereto:

3.2.1. Military funerals, memorial services, weddings, and inaugurals.

3.2.2. Parades on National or State holidays; or other parades or ceremonies of a patriotic character in which any Active or Reserve United States military unit is taking part.

3.2.3. Wearing of the uniform or any part thereof at any other time or for any other purposes is prohibited.

3.3. Medal of Honor holders may wear the uniform at their pleasure except under the circumstances set forth in paragraph 3.1., above.