The U.S. Army Combat Capabilities Development Command – Chemical Biological Center (DEVCOM CBC) is seeking proposals for a 40mm Counter Unmanned Aerial System (CUAS) through the Cornerstone Other Transaction Agreement (OTA). The objective of this effort is to integrate advanced proximity sensing fuze technology into programmable air burst cartridges for the MK19 grenade launcher, establishing a comprehensive system-level solution for countering small UAS threats for the Army. This necessitates the development of a fully integrated system encompassing detection, tracking, targeting, and defeat functionalities, crucially including seamless integration with existing weapon platforms, fire control systems, and remote weapon stations. Key aspects of the proposal include: • Development of a fully integrated system for countering small UAS threats • Integration with existing weapon platforms, fire control systems, and remote weapon stations • Advanced proximity sensing fuze technology • Programmable air burst cartridges for the MK19 grenade launcher • A Secret Facility Security Clearance is required • Entities must be members of the Cornerstone consortium to be awarded this OTA task