Before you start calling someone a liar, check your facts.
Civilian
"A civilian under International Humanitarian Law is a person who is not a member of his or
her country's armed forces."
I guess you could say "Some people" use it that way.
Ratification of IHL by nation and treaty
Oh, 194 nations have signed GC I-IV 1949. ya..
You can get more IHL info here.
The news reports cited the two officers as "civilian police officer"
"Civilian police officer Sergeant Kimberly Munley"
"Civilian police officer Sergeant Mark Todd"
http://www.stripes.com/article.asp?section=104&article=65937
"The buildings that comprised the Soldier Family Readiness Center sit on top of a hill. Civilian police officer Sgt. Kimberly Munley, who was nearby doing routine daily maintenance on her patrol car when the gunshots rang out, was able to approach the scene using one of the buildings as cover. "
"Mark Todd, another civilian officer, rushed up the hill and began firing at Hasan."
http://militarytimes.com/news/2009/11/ap_army_hood_carnage_110609/
"Around this time, Fort Hood Police Sgt. Kimberly Munley got the call of "shots fired." The SRP isn't on Munley's beat; she was in the area because her vehicle was in the shop."
So, yes, an armed civilian, who was in the area. Munley wasn't on duty, providing security services to that location. She was with her patrol car at the shop.
I looked around a little. I didn't find what Todd was doing. If I remember right though, he was doing traffic control nearby.