A graphic of the evolution of the U.S. Navy's strategic weapon systems, sustained and maintained by Portfolio Acquisition Executive Strategic Systems Programs, from 1955 to present day. SSP is the Navy command responsible for sustaining the Navy’s SWS on the Ohio-class SSBN and supporting the integration of the D5LE weapon system on the new Columbia-class SSBNs. Looking to the future, SSP is actively modernizing the sea-based leg of the nuclear triad through development of the D5LE2 SWS and pioneering regional strike capabilities of the future through development of the nuclear-armed sea launched cruise missile (SLCM-N) and the non-nuclear hypersonic conventional prompt strike system (CPS).