First to Forty
From 3rd ID Wiki
Originally known as "Briggs' First to Forty," this game was created on the fly as a morale booster to round out repetetive bi-weekly drills which consisted of rifle practice and grenade practice. Gravity is usually lowered in the server settings, TK punish is turned off, everyone joins the American team and has it out at point-blank. The only hard and fast rule is that the first player to die forty times is declared the loser.
In true Briggs fashion there are no winners - just different levels of losers.