[bnelson44]

Some rules for the military in this arena:

DoD Directive 1325.6 and DoD Directive 7050.6 (pdf).

Needless to say, the Democrats should not have cut the soldier off. They are not MPs and are not briefed on the UCMJ.

[Tribune7]

E3.3.8. Speak before a partisan political gathering, including any gathering that promotes a partisan political party, candidate, or cause.

Was this particular panel at the Yearly Kos described by the organizers as a Dem event or as an informational/educational/conscious-raising etc. event? Would that make a difference?