Particle Accelerator Cannon (Infinity)

The Particle Accelerator Cannon, also known more simply as the PAC, was a type of heavy weaponry used by all branches of the United Nations Space Command Defense Force. Introduced in 2593, it wouldn't gain prevalence for another fifty years though individual ships or lesser classes would adopt it in multiple cases; the Particle Accelerator Cannon operates on the same principles as the Covenant's energy projector and Beam Rifle: accelerating a pulse of ionized hydrogen particles (the particles gaining or losing on electron) at hostile targets, often causing heavy damage.

Vessels Wielding PAC Prototypes

 * UNSC Boatman's Tempest
 * UNSC 2012