sitigeltfel,
Spot on, I was about to post the same thing. "An MP," AIDS charities, Marie Curie, the RNIB or the Red Cross are not under the control of the government; the armed forces are. You have a direct link to them and are, along with your peers, responsible for putting them in harm's way.
This is absolutely not the same as "raising awareness" from some charity that operates in your constituency. Big own goal here, I feel.