Many federal agencies play a role in humanitarian, disaster and emergency relief missions: The Federal Emergency Management Agency has to move people, equipment and supplies anywhere in the country on short notice, while US-AID has similar requirements on an international basis.
Other agencies play complex roles in supporting federal programs—for example, the State Department has to supply its network of embassies and consulates around the world with a mix of standardized and locally purchased goods and services; the Department of Interior's national parks system is widely scattered, and each park has some unique supply needs; the Defense Department has its military role but also provides support to civilian agencies at all levels (federal, state, local, tribal), often on short notice.
The key to attaining optimized cost and performance outcomes within these multiple supply chains is to strategically align processes within each organization, and to identify ways to align across organizations.