The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking proposals for the procurement of five antenna assemblies under the presolicitation notice. This procurement involves a flight-critical item, identified by NSN 7R-5985-015874866-P8 and reference number 131K876G01, which requires government source approval prior to contract award, as the technical data available does not support full and open competition. Interested vendors must provide detailed information regarding their production capabilities and experience, as well as comply with the Source Approval Information Brochures to be considered for the award. For further inquiries, interested parties can contact Sarah E. Crompton at (215) 697-5809 or via email at SARAH.E.CROMPTON.CIV@US.NAVY.MIL.