USA-319, also known as GPS-III SV05, NAVSTAR 81 or Neil Armstrong, is a United States navigation satellite which forms part of the Global Positioning System.

The spacecraft is built on the Lockheed Martin A2100 satellite bus, and weighs approximately 4,331 kg (9,548 lb).

[1] SV05 is the 24th operational Military Code (M-Code) satellite to join the GPS constellation, the last required for M-Code Full Operational Capability.

USA-319 was launched by SpaceX on 17 June 2021 at 16:09 UTC, atop Falcon 9 booster B1062.

About eight minutes after launch, Falcon 9 successfully landed on the droneship Just Read the Instructions.