Playtestin' news - Gasmask Citizen 22 mod for Half-Life 2 - Mod DB
In Half-Life 2 the Civilian Police's gas masks are designed after a standard soviet gas mask. : r/gaming
real on Twitter: "Retail Citizen meets Beta Gas mask Citizen / Half-Life 2 Fan art #halflife #halflife2 #halflifefanart #fanart https://t.co/X3cpXsBAXP" / Twitter
Half Life gravity gun light up gas mask by TwoHornsUnited on DeviantArt
Combine Gas Masks and the real life influences - YouTube