Prone is a stance where one lies on the ground belly-down. While prone, a person can crawl underneath certain obstacles that they could not when either crouching or standing. This stance may as well be used to deploy a bipod. Proning is featured many installments of the Battlefield Series.
In Battlefield 1942 prone minimizes one's profile, and decreases movement speed. However, prone also changes the in-game ballistics so that headshots more accurate when engaging enemies at the front.
In Battlefield Vietnam, prone drastically increases light machinegun effectiveness. It also minimizes one's profile. However, while prone, one must crawl at a very slow rate.
In Battlefield 2, prone still increases the accuracy of LMGs. Like previous iterations, prone decreases movement speed and minimizes profile. Unlike other installments, however, there is an added penalty inflicted upon players who change from prone to standing, in that there is a delay during which the player cannot fire.
Proning in Battlefield 2142 still increases LMG accuracy and reduces profile and movement.
Players dropping into prone position take a temporary accuracy penalty, but recover their aim after a few seconds. This was added to minimize dropshotting or dolphin diving, where players immediately gained an accuracy bonus for going prone even after leaping.
In Battlefield 3 Prone minimizes player profile and additionally increases hip accuracy for all weapons by a small degree. Additionally, one can crawl through certain obstacles and into certain areas that other players cannot. Players can also use the prone position to make use of a weapon's bipod if they do not wish to use it on cover.
Rotation while prone is confined to a roughly 90° arc, beyond which the player character repositions himself. Like Battlefield 2, a players need additional time to rise to a crouch or stand.
The prone stance appears in Battlefield 4 and functions almost identically to Battlefield 3. Players can no longer prone backed up closely against a wall causing their legs to clip through, however. When attempting to do so, the player's character will move forward on his own until he is far enough away from the wall that no clipping will occur.
- In Battlefield 1942, the hitbox of a character conforms to the surface it is prone on unless it is too steep. Due to the quirky prone mechanic, many humorous angles can be achieved.
- Slopes still prove problematic in later games, as the player model in third-person view may appear to burrow into the ground or lean away as if a board used for a ramp, while the prone player's first-person view appears level and normal.
- Clipping may occur if a player goes prone near a thin wall, allowing someone on the other side to attack feet and legs through the wall, even if it should normally prevent the players from seeing each other. This was fixed in Battlefield 4.
- Players that are revived in games that feature the prone position will recover into the position, facing the same direction they were facing before. This may cause the revived player's model to flip hard if they fell backwards when shot down.
- The popularity of the "Dolphin Dive" tactic in Battlefield 2 was referenced in Battlefield 3: Back to Karkand with the "Diving Dolphin" dogtag.