TR/9 trip mine

"A simple proximity mine that reacts to pressure or movement."

- Bungie.net stats description

The TR/9 Antipersonnel Mine (TR/9 AP Mine), commonly known to United Nations Space Command forces as the trip mine, "Tripper", "Skippy", "Automatic Guard", "Invisible Fence" or simply "Mine", is a landmine developed by the the UNSC.

Design details
The TR/9 takes a circular form, with six fins protruding off the side. The centre of the disc has another four fins that, when the mine is activated, rotate upward. The mine's activation also sees it light up and emit a high-pitched beeping noise. The mine can use trip wires or laser beams to trigger the detonator, when something large enough gets within range. Despite its flower-like appearance, the TR/9 trip mine is not the Lotus anti-tank mine,

Usage
The tripmine is employed for defensive usage, and is used in siege warfare and guerrilla tactics. They are used in the defence of perimeters or placed alongside enemy paths.

Operational history
The TR/9 trip mine was originally developed for UNSC forces, though as with many pieces of equipment, was often stolen and deployed by Covenant loyalist Jiralhanae forces during the later stages of the Human-Covenant War. Jiralhanae equipped with these mines were deployed during the Battle for Earth and Battle of Installation 00 in late 2552. In the post-war era, Jiralhanae Jumpers allied with Merg Vol's Covenant also employed the TR/9 trip mines.

Gameplay

 * Sometimes, while playing in multiplayer or campaign, players can either accidentally run or drive over their own trip mines or those of their teammate(s).
 * A trip mine's distinctive beeping and orange glow makes it easy to detect.
 * The trip mine will only stay active for 90 seconds before spontaneously exploding.
 * Trip mines can be detonated from a distance by weapons fire, and are therefore only useful when unnoticed.
 * The trip mine is often difficult to use in split-screen local games due to the sound it makes when deployed, causing other players to screenwatch.

Production notes
In earlier stages of development, the trip mine in Halo 3 had a Covenant-themed texture, featuring purple metal and blue lights. This cut variant can be found in the files of the Halo 3 Beta, though unused. In the Halo 3 Beta, deployed trip mines could stick to the bottom of a motionless vehicle. If the vehicle then moved, the mine would explode, killing all players inside of it.

Trivia

 * The trip mine's heads-up display icon, along with that of the bubble shield, can be used in a Halo 3 Emblem.
 * Trip mines can be used to overload a map or launch an Elephant.

List of appearances

 * Halo 3
 * Halo: Spartan Assault
 * Halo Wars 2