

Within Gears of War 3, some cover can be destroyed after taking some amount of damage, which can be used to a tactical advantage to draw out enemies from cover. Players can quickly switch between nearby covering walls or jump over lower cover to rush forward. The player and their allies and enemies can use nearly any structure as cover, firing blind from behind it or leaning out to take aimed shots while usually exposing their head more. Similarly, the player can also cause enemies to fall into bleed-out in the same manner.

Some types of damage, such as explosives or head shots, can kill the player immediately without the bleed-out period. The player can also be killed during the bleed-out by the use of the game's signature execution moves by the enemy. By staying out of the line of fire, this will dissipate, but by taking too much damage, the player will become downed or killed, and must be brought to their feet by an ally within a short "bleed-out" period, or else the player will die, unless playing the game on Insane difficultly level in which case a player will die immediately after taking too much damage without the bleed-out. When in combat, the player can take some damage from enemy fire, filling a blood-colored "crimson omen" on the HUD as a measure of the player's health, unlike the traditional health bar in other shooters. At times, the player can carry a heavier but more powerful weapon, such as a mortar or gatling gun, which slows their pace while it is carried. Alternatively, the player can opt to not try to for the active reload, reloading the weapon at normal speed, but with no added damage. If they press the button outside this section, this temporarily jams the weapon, leaving the player vulnerable and taking longer to reload. If the player hits a control button when the cursor is in the marked section, they will reload faster with the resulting reload being slightly more powerful than normal bullets, causing more damage to opponents. When the player reloads a weapons ammunition, they have an opportunity for an "active reload", shown by a small cursor moving over a line with a marked section on the player's heads-up display (HUD). Most weapons feature a secondary fire mode the game's signature rifle, the Lancer, includes a chainsaw bayonet that can be used at close range to slice through enemies. The player's character can carry four weapons: one pistol, one set of grenades, and two other weapons, all which can be swapped with other weapons dropped by fallen foes or at stockpiles throughout the game, along with ammunition. Gears of War 3, like its predecessors, is a third-person shooter that emphasizes the use of cover and squad tactics in order to survive combat situations.
