Whoa. I was doing hmds back in 95. 
'Doom 3' in virtual reality: we check out John Carmack's prototype head mounted display
Id Software has just announced Doom 3 BFG Edition, a "director's cut" of the 2004 first-person shooter with new missions as well as refined visuals and gameplay mechanics — including a flashlight on the vest so you can have light while you shoot. But buried in the press release, there's one line in particular worth paying attention to: new support for 3D TVs and head mounted displays. Those who follow John Carmack on Twitter might have noticed his recent obsession over the last six months with head mounted displays. We flew down to Dallas to check out the culmination of this newfound passion — a modified "Oculus Rift" head mounted display locked. Carmack himself invited us into his self-described "mad scientist lair" — video...
