M57 Pilum

The M57 Pilum Assault Weapon is a shoulder-fired heavy weapon issued to personnel of the UNSC Army, UNSC Marine Corps, and the Spartan branch around October 2558. It performs very similarly to the M41 SPNKR it replaced.

Design details
Despite performing much the same as the M41 rocket launcher, the M57 rocket launcher is cheaper and substantially lighter, though the M57 is still capable of considerable damage. The M57 rocket launcher is also significantly different in design philosophy, featuring a single, reusable, fixed tube and detachable box magazines rather than dual, rotating, pre-loaded, disposable tubes.

The weapon is fed by a two-round detachable box magazine on the upper left side, forward of the user. The magazine retracts into the weapon when chambering each round, similar to the Type-33 fuel rod gun. A 2x magnification scope folds out from a module on the left side when activated. Its missiles are able to lock onto aircraft if the operator uses smart scope. Standard warheads used by the rocket launcher are 50mm high-explosive multi-purpose, but specialist rounds are also available, including those with thermobaric fillers or dumb AI-driven "brilliant" guidance systems.

Variants

 * Ad Victoriam: Fires three laser-guided missiles in a "V" formation. All three missiles feature an airburst proximity fuse. The operator can use smart scope in order to guide the missiles with the reticle, and doing so will fire the missiles in a cluster rather than a "V" formation.
 * High Five: Fires five Hydra MLRS mini-missiles that will lock onto both ground and air targets. Unlike the base model and the Ad Victorum smart scope is not needed for the missiles to lock onto targets.

Trivia

 * The weapon's color palette was changed since the beta, going from a more subdued green color to a more vivid green with yellow accents, possibly to increase visual recognition and alert players to its presence.
 * Pilum is named after the thrown javelin of the ancient Roman army, innovative at its time for its construction: the metal tip also used softer metal at its base, which meant it was likely to get bent if it missed its target, thus being less useful for the enemy to be thrown back.

Videos
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List of appearances

 * Halo 5: Guardians