When Walter Harriman is interviewed, the name tag on his uniform reads "Davis."
When researching the alien probe, Major Carter states "SG-13 really kicked the crap out of this thing." Later when requesting backup Colonel Dixon identifies his team as SG-9. (Actually, Dixon identifies himself as SG-niner, which seems to be shorthand for the commander of the SG team. It's akin to Admiral Adama identifying himself as Galactica Actual when talking to vipers or the fleet. In a number of episodes, O'Neill identifies himself as SG-1-niner, particularly when there are other SG teams nearby, and similarly refers to other SG team leaders as SG-[whatever]-niner. Since Hammond was talking to Dixon and presumably knew the team of which he was the leader, Dixon did not need to repeat the full team identifier.)
A seasoned air force colonel wouldn't fire at something metallic at close range and risk a ricochet killing a member of his team.
Colonel Rundell is out of uniform. His mustache is out of regulation. Male Air Force members - enlisted and commissioned - are allowed to have mustaches but the mustache is not allowed to continue past the vermilion of the lips. No colonel would ever be caught so far out of regs.