iteration of Critical Design Review (CDR) in September 2018. Software development on Block 1 is scheduled to complete in 2019, after which the Block 1 software will undergo 2.5 years of system testing. OCX Block 2 (military GPS III features, civilian signal monitoring) OCX Block 2 upgrades OCX with the advanced M-code features for military users and the ability to monitor performance of the civilian signals. In March 2017, the contractor rephased its OCX delivery schedule so that Block 2 will now be delivered to the Air Force concurrently with Block 1. In July 2017, an additional nine months delay to the schedule was announced. According to the July 2017 program schedule, OCX will be delivered to the Air Force in April 2022. OCX Block 3F (launch and checkout for Block IIIF) OCX Block 3F upgrades OCX with the ability to do Launch & Checkout for Block IIIF satellites. Block IIIF satellites are expected to start launching in 2026. The OCX Block 3F contract, valued at $228 million, was awarded to Raytheon Intelligence and Space on April 30, 2021. Contingency operations GPS III Contingency Operations ("COps") is an update to the GPS Operational Control Segment, allowing OCS to provide Block IIF Position, Navigation, and Timing (PNT) features from GPS III satellites. The Contingency Operations effort enables GPS III satellites to participate in the GPS constellation, albeit in a limited fashion, without having to wait until OCX Block 1 becomes operational (currently scheduled for 2022). The United States Space Force awarded the US$96 million Contingency Operations contract in February 2016. Contingency Ops was operationally accepted by in April 2020. Deployment schedule See also GPS Block IIIF GPS signals GPS satellite blocks List of GPS satellites Michibiki - New Japanese designed and launched satellites designed to enhance GPS within Japan. References External links Global Positioning System Satellites using the A2100 bus SpaceX military payloads