Type 14 Magnetic/Anti-Tank Mine

The Type 14 Magnetic/Anti-Tank Mine is a UNSC explosive. This is also used as "the bomb" in Assault-type games from Halo 2 and Halo 3.

Background
It is used as both a mine and a satchel-charge type bomb. The arming fuse can be set for five, ten, or fifteen seconds, and has a massive area of effect. The magnetic attachment device ensures that it will adhere to a vehicle which passes over it.

Messages
The messages seem to correspond to what map is used.

For instance, the message "Thus I Refute Thee" appears on the maps Ivory Tower, Waterworks, Turf, Backwash, Elongation, Relic, Foundry. A similar description of the bomb is present on Bungie.net's matchmaking stats section of the service record.

"Hold Onto Yer Butt" appears on Ascension, Burial Mounds, Warlock, Gemini.

"Kiss It Goodbye" on Coagulation, Headlong, Sanctuary, Terminal and on Tombstone as well.

Hieroglyph of a Spartan helmet, the two fingered peace symbol then xoxo &hearts; appears on Lockout, Midship, Beaver Creek, Colossus, Zanzibar, Foundation, Containment and on Desolation.

Trivia

 * Additionally, it is used to portray Andy in the machinima series Red vs. Blue.
 * There are messages written on the bomb.
 * It has been remade for use in several custom maps on Halo Custom Edition, behaving similar like an Assault Bomb.
 * It is the object used in the game type: Grifball.