Half-Life: Guard Duty Trailer

Half-Life: Guard Duty Trailer (Early Half-Life: Blue Shift trailer)

Combine OverWiki

Half Life Guard Duty (early blue shift) Trailer VS Half Life Blue Shift Trailer

TheWiiHomebrewAddict

HL: Guard Duty Trailer VS HL: Blue Shift Trailer VS HL: Blue Shift Trailer 1.2

TheWiiHomebrewAddict

Half Life Blue Shift Trailer

Operation Black Mesa/Guard Duty: Weapons Update

Tripmine Studios

Black Mesa : Guard Duty (HL:BS Trailer Remake)

Half Life Guard Duty Trailer (HL1 Mod)

Guard Duty Flashlight | Teaser #2

Tripmine Studios

Half-Life: Blue Shift before Blue Shift

Can This Mod Make Half-Life 2 Feel Brand New Again?

thebluecrusader

Early Half-Life Blue Shift Trailer

Half-Life: Blue Shift | Trailer Theme REMAKE『HD』

Guard Duty - Trailer

Black Mesa - Security Guard Hive Hand Lines (Easter Egg) | Dissy EX

Evolution Of Half Life's Security Guard

Radiation Hazard

Half-Life: Blue Shift - Ad Trailer

Old Beta [Games]

Half-Life trailer (1997)

Black Mesa Security Guard Loses It!

Half-Life Guard Duty: Blue Shift (ENTRY 01)

Half-Life: Dying Security Guard