The Department of Defense, specifically the Naval Air Systems Command (NAVAIR), is planning to issue a sole source Delivery Order to Northrop Grumman for an Engineering Investigation (EI) related to the testing of FMU-139 fuzes for F-35 variant platforms. This procurement aims to document the testing of 20 NGC-owned fuzes to secure approval for their use across all F-35 models, highlighting the critical role these components play in military operations. Northrop Grumman is uniquely positioned to fulfill this requirement as the sole designer and manufacturer of the FMU-139D/B fuzes, possessing the necessary expertise and resources. Interested parties may express their capabilities to the primary contact, Elizabeth Scott, at elizabeth.a.scott84.civ@us.navy.mil, or secondary contact Jennifer Vance at jennifer.c.vance2.civ@us.navy.mil, although the government will not compensate for any responses received.