We-ll..................it's one of those things, damned if you do, damned if you don't (drop your cover), but essentially one should know, "When tactical comes busting in, you hit the deck." (ie, don't stand up and don't grab a gun to try to help)
The basic thing of it is that for the responding good guy, anyone with a gun that they don't know can be a bad guy.........and that's a point I believe a lot of people either don't know, don't realize, or forget.
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(Hearing a helicopter approaching the hanger where the alien spacecraft are stored, "Good guys or bad guys?"––Harrison Blackwood
"Doctor, considering what we are doing, everyone is potentially a bad guy."––Col. Ironhorse on them destroying the spacecraft, (w,stte), "War of the Worlds")