In 2253, the retaliatory Pacification of the Mojave was carried out by an overwhelming force of three battalions, in a protracted war that lasted seventeen years. Following the death of President Tandi, it has also became an instrument of expansion, further developing its numbers. The Army has continued to grow and serve NCR's interests, securing its expansion and protecting territories under its control.

Decades of fighting an asymmetric war against them turned the Army into a powerful instrument of foreign policy. Until the containment operations against the Enclave at Navarro, following the destruction of their capital and headquarters, the Army's primary foes were raiders, such as the Fiends, Vipers, and Great Khans. The New California Republic Rangers, originally an independent paramilitary force, were incorporated into the military in subsequent decades, becoming an indispensable element of its operations. The origins of the army are not detailed, but by 2241 it was the largest standing army in New California, composed of several divisions, including special (mechanized) cavalry and other mechanized units.

New california republic bear