The Air Force on Dec. 13 released a draft request for proposal (RFP) for its U.S. Enterprise Rideshare Long Duration Propulsive EELV Secondary Payload Adapters (LDPE), according to a notice posted on Federal Business Opportunities (FBO).

The EELV secondary payload adapters effort is an Air Force Research Laboratory (AFRL) initiative to host auxiliary payloads on primary spacecraft launch missions. LDPE extends Air Force Space Command’s (AFSPC) standard service policy for rideshare, leveraging previous propulsive ESPA development.

LDPE will be controlled using Enterprise Ground Services as the baseline for command and control.  The effort will include spacecraft payload integration services and one year of early orbit checkout and operations.