the single entity to direct and supervise execution of the Strategic Distribution system" in order to "improve the overall efficiency and interoperability of distribution related activities—deployment, sustainment and redeployment support during peace and war." With the most capable and ready air, land, and sea strategic mobility forces in the world, and with the authorities as the DPO, USTRANSCOM will continue to support the United States and its allies, in peace and war. Current activities Cyber threats remain a major concern for USTRANSCOM. Nearly 90 percent of USTRANSCOM missions are executed over unclassified and commercial networks because of its extensive use of commercial capabilities. USTRANSCOM's Joint Cyber Center (JCC) uses a process known as the Cyber Staff Estimate to assess risk, adjust defensive posture, and adopt operational or technical mitigations in performance of key missions. USTRANSCOM integrates cyber security language into a majority of its commercial contracts and co-chairs the National Defense Transportation Association Cybersecurity Committee. Airlift and Aerial Refueling Airlift forces move critical cargo and people to the point of need, while air refueling capabilities enable projection of forces across great distances to any location at any time. The Air Force's primary airlift workhorse, the Boeing C-17 Globemaster III, remains the backbone of the United States' strategic airlift capability. To continue the C-17's airworthiness and meet Federal Aviation Administration (FAA) 2020 mandates, the Air Force has planned a series of modifications for the early 2020s and is pursuing a mitigation plan to restore 16 of their C-17 aircraft from Backup Aircraft Inventory to Primary Mission Aircraft Inventory. The Lockheed C-5 Galaxy fleet is currently undergoing a Reliability Enhancement and Reengining Program modification through April 2018, which will extend service life past 2040. Additionally, USTRANSCOM is building partnership capacity with other nations possessing air refueling competencies. Greater interoperability among nations will strengthen coalition partnerships and provide additional capability to the combatant commands. Surface Civil sector transportation infrastructure enables the movement of military forces. The Defense Personal Property Program (DP3), administered by SDDC, enables the movement and storage of service member, DoD employee, and U.S. Coast Guard (USCG) employee personal property and privately owned vehicles. DP3, in collaboration with Transportation Service Providers (TSP), manages over 550,000 personal property shipments for DoD and USCG customers at an annual cost of $2 billion. The Defense Personal Property System (DPS) and its associated Program Management Office provide a centralized, web-based, single-point interface system for worldwide