The Naval Air Systems Command intends to award a sole-source Indefinite Delivery Indefinite Quantity (IDIQ) contract to Northrop Grumman for E-2D Advanced Hawkeye Block II retrofit kits, including hardware, software, training, and logistical support. The anticipated period of performance is five years, with an award expected in the 2nd quarter of fiscal year 2028. No budget amount is specified. Performance will involve procurement, storage, assembly, and installation of retrofit kits for the E-2D aircraft. This is a sources sought notice for market research only, not a solicitation, and interested parties must submit a capabilities statement by 4:00 PM Eastern on July 31, 2026.