友军伤害
关于帮助好友完成合同的机制，详见友军伤害(机制）。
| “ | 看着吧，他很快就会变回红色……
很快就会……
— 伤害了队友的蓝队士兵
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友军伤害（Friendly fire）通常指一名玩家伤害或杀死自己的队友的行为。
在早期军团要塞2测试版时，服务器将默认开启友军伤害。这将帮助医生快速就绪超能冲锋同时也协助了间谍的行动，并阻碍玩家进行检查间谍的活动。而Valve于后期因可能导致服务器崩溃以及被玩家恶意使用的理由，将其设置为默认关闭。并且开启友军伤害会使一些准度较低的兵种难以与团队合作推进。
开启友军伤害一直作为服务器的设置选项之一，但很少用于标准的游戏模式中。该机制于测试版加入后便未曾更新。击杀友军将减少玩家的击杀数(并且可以变为负数)，但依然会增加玩家的分数。
一些服务器会因特殊原因（通常为，玩家人数不足、回合结束、僵局期间）而暂时开启友军伤害。
目录
控制台设置
mp_friendlyfire 0/1
正常游戏情况中
- 作为医生，当治疗间谍时协助其杀死队友或摧毁建筑，将使医生像是敌方队伍一样获得助攻及分数（以及连杀或控制队友）。
- 当玩家杀死了正要被自动平衡过来时的敌人，右上角的杀敌反馈中，将显示为友军伤害。
- 由于最近的更新，休闲模式中的玩家将因 Meet Your Match 更新中快速游戏的更改而无法被自动平衡。
特殊游戏情况中（开启友军伤害）
通用
- It is impossible to damage or destroy an allied building.
- Certain taunts that use a weapon capable of friendly fire, including Kamikaze, Hadouken, and Fencing, can damage all allies in the area of the taunt. However, others do not, such as Skewer or Spinal Tap.
- Critical hits and mini-crits are still in effect. Most weapons which have special conditions to crit, such as the Ambassador or Bushwacka, will also continue to work properly.
侦察兵
- Mad Milk will not affect teammates negatively.
- The Flying Guillotine will not damage allies.
- The Sandman's ball will not damage or slow allies.
- The Fan O'War will not mark allies for death.
- The Wrap Assassin's bauble will damage teammates but not apply bleed.
士兵
- For about the first 128 Hammer Units of their flight, Rockets will pass through allies but deal splash damage from the resulting explosions.
- The Righteous Bison, which uses bundles of flame particles to simulate projectiles, does not damage teammates.
- The Mantreads will not damage teammates.
火焰兵
- Flamethrowers will not ignite or damage teammates.
- Airblasting a burning ally will extinguish them and give the Pyro 20 health, however no knockback is resulted from airblasting a teammate.
- For about the first 300 Hammer Units of their flight, flares from the Flare Gun, Detonator, and Scorch Shot will pass through burning teammates, but the Detonator and Scorch Shot will deal splash damage from the resulting explosions and still set teammates on fire.
- The Manmelter will not ignite or damage teammates.
- The Hot Hand will not provide the speed boost on hit when slapping a teammate.
爆破手
- For about the first 128 Hammer Units of their flight, Grenades and Stickybombs will pass through allies but deal splash damage from the resulting explosions.
- The Chargin' Targe, Splendid Screen, and Tide Turner will cause the Demoman to pass straight through allies. However, if the ally is up against a wall and the Demoman charges at them perpendicularly to the wall, damage will be dealt and the resulting 'cheer' sound effect will play.
- The Ullapool Caber will deal melee damage to allies but will not explode on hitting an ally.
- The Loose Cannon does not damage teammates on collision, and Double-Donking cannot occur as a result of this.
机枪手
- The Huo-Long Heater's fire ring will not ignite or damage teammates.
- The Holiday Punch will not damage teammates from behind as per norm, however will not force them to laugh.
工程师
- For about the first 300 Hammer Units of their flight, level 3 Sentry Gun rockets will pass through teammates but deal splash damage from the resulting explosions.
- The Pomson 6000 does not drain Ubercharge or Cloak from friendly Medics or Spies.
- The Short Circuit's primary fire attack will damage teammates, but its alt-fire attack will not.
- The Widowmaker does not re-gain metal on hitting a friendly player.
- The Gunslinger's three-hit-combo does not affect teammates if the former two hits were on teammates. However, hitting an enemy twice will lead to third hit dealing a crit to a teammate.
- Sentry Guns will not target teammates, and will not lock onto them if aimed at using the Wrangler.
- Teammates cannot be telefragged.
医生
- The Crusader's Crossbow will heal teammates, rather than hurt them.
- The Ubersaw will not build uber upon hurting a teammate.
- The Blutsauger will not heal the Medic using it on hitting an ally.
狙击手
- Most primary weapons will not damage teammates. However, a fully-charged Machina shot will deal damage, as well as dealing penetrating damage to teammates.
- Jarate will not affect teammates negatively.
- Shooting teammates with the Cleaner's Carbine will damage them, however it will not fill up the "CRIKEY" meter.
间谍
- It is impossible to backstab teammates or sap allied buildings.
画廊
Examples
A Heavy killing a Scout on his team with friendly fire enabled.
A Medic getting an assist for healing an enemy Spy that backstabbed a Sniper.
