I'm looking for a holster for my H&K USP 9mm. I got an Uncle Mike's Sidekick when I got the gun, so I have someplace to stick it when I'm inspecting my targets, but I'm enrolling in a Police Academy, and they demand that I have a "direct-draw" holster. I have no idea what that is. Can anyone give me some suggestions? Brand? Things to look out for? Concealability isn't an issue, because I doubt it's possible to carry this brick of a gun discreetly and comfortably. Any help would be appreciated.