IC Technology & Surveillance — 2026-05-09

NRO Schedules NROL-172 Launch to Expand Proliferated Satellite Constellation

The NRO announced May 8 that NROL-172, flying on a SpaceX Falcon 9, is scheduled no earlier than May 11 from SLC-4E at Vandenberg Space Force Base, California, per Aviation Week. The Spaceflight Now manifest lists a 3:28 p.m. PDT window and identifies the flight as the 12th NRO mission supporting its proliferated low Earth orbit architecture, which the site characterizes as believed to consist of Starshield satellites. Booster B1103, on its second flight, will target recovery on the drone ship "Of Course I Still Love You" in the Pacific. The schedule has shifted at least twice: Spaceflight Now notes the date moved from May 12 to May 13 before being advanced to May 11.

Analysis
NROL-172 likely launches by May 18, grounded in eleven prior NRO sorties from SLC-4E without documented range constraints and no reported payload or vehicle anomalies. The three-way schedule oscillation, May 12 to May 13 then advanced to May 11, tracks routine range deconfliction, but may instead reflect an unresolved technical constraint that leaves the May 11 date at further slippage risk. Booster B1103 was previously manifested for a Starlink mission before reassignment to NROL-172, consistent with NRO scheduling priorities displacing commercial flights. All operational detail derives from Spaceflight Now's public manifest, with no named officials.

3 sources

Next NRO Launch Expected As Early As May 11 - Aviation Week
NROL-172 Mission - SpaceX
Launch Schedule – Spaceflight Now