Common Defensive Weapon System

The Common Defensive Weapon System (CDWS) is a Navy budget line item (LI 0581) under the Aircraft Procurement, Navy appropriation, specifically focused on the modification of aircraft. The primary goal of this program is to procure, replace, and upgrade crew-served defensive weapon systems on US Navy and Marine Corps assault and assault support helicopter platforms, including the MV-22, CH-53E/K, UH-1Y, and MH-60 R/S. The program supports both the procurement of new weapons and the replacement of those deemed Beyond Capable Maintenance (BCM), ensuring that deployed forces maintain effective and reliable defensive capabilities.

The CDWS program funds the acquisition and integration of several weapon systems, such as the GAU-21 .50 caliber machine gun, M240D, GAU-17, GAU-24, and associated components like cradles, ammo boxes, feed/link chutes, lasers, and platform-specific mount systems. It was established to replace obsolete weapons, notably the GAU-16 and XM-218 .50 caliber machine guns, with modern systems that offer improved safety, reliability, accuracy, and a higher rate of fire. For the CH-53K, which is still in production, the program also supports the procurement of ramp, door, and window-mounted CDWS configurations.

A key objective of the CDWS line item is to enhance mission effectiveness and readiness for Navy and Marine Corps aviation units. This is achieved by supporting modifications and improvements to crew-served weapon systems, including updates to technical data packages, procurement of kit parts, provisioning, and sustainment requirements. The FY 2026 budget request funds the procurement of GAU-21 and M240D machine guns, as well as support costs associated with Engineering Change Proposals (ECPs) that address obsolescence, readiness, and product improvements.

Future Readiness Team (FRT) initiatives are another important aspect of the CDWS program. FY 2026 funding supports FRT efforts aimed at improving readiness and addressing obsolescence issues in components such as the GAU-17/24 Gun Control Unit/Trigger Control Unit (GCU/TCU) and the integration of Automated Shot Counter technology. These initiatives are designed to ensure that the weapon systems remain effective and sustainable in the face of evolving operational requirements and technological advancements.

The budget justification also notes reductions in FY 2026 for Advisory and Assistance Services and civilian personnel, aligning with Executive Orders 14222 and 14210, which promote government efficiency and workforce optimization. These reductions are intended to streamline program management and optimize resource allocation without compromising the program's core objectives.

Within LI 0581, there are two primary modification lines. The first encompasses the bulk of the procurement and support activities, including the acquisition of weapons, support equipment, and non-recurring engineering. The second reflects prior year totals for inactive projects and does not include new funding or procurement activities in FY 2026.