1. Two Block 2006 Flight Demonstrators are planned to launch in 2007 on a Delta II launch vehicle; both satellites were built in 1999 by Northrop Grumman for the former SBIRS Low program. 2. Operational STSS satellites will be integrated in the 2013/14 timeframe for launch NET 2015. 3. Contract award for STSS Follow-On satellites (formerly Block 2012) will be sole-sourced to Northrop Grumman; award expected in late 2007.
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