This series of satellites is likely a new series of geostationary ELINT/SIGINT satellites.
Likely they consist of a large antenna and are three axis stabilized. Leaked NRO bugets documents identfy the SHARP (SIGINT High Altitude Replenishment Program) program, which could also be a possibility for this payload. These satellites might otherwise represent a next generation of the Orion satellites. Another possibility is a geostationary version of the Trumpet Follow-On series.
|Type / Application:||SIGINT, ELINT, COMINT ?|
|Configuration:||Large Dish Antenna, 3-Axis-Stabilization|
|Mass:||3400 kg - 3850 kg|
|SHARP 1 ? (USA 250, NROL 67)||2014-020A||10.04.2014||CC LC-41||Atlas-5(541)|