Under the Formerly Utilized Sites Remedial Action Program (FUSRAP), the U.S. Army Corps of Engineers (USACE) is cleaning up sites with contamination resulting from the Nation’s early atomic energy program. FUSRAP was initiated in 1974 to identify, investigate and, if necessary, clean up or control sites throughout the United States contaminated as a result of Manhattan Engineer District (MED) or early Atomic Energy Commission (AEC) activities. Both the MED and the AEC were predecessors of the U.S. Department of Energy (DOE).

Congress transferred administration and execution of FUSRAP cleanups from the DOE to USACE in October 1997. USACE continues to address sites the DOE began, sites that were referred to USACE by the DOE Office of Legacy Management under a USACE/DOE Memorandum of Understanding, and one site added to the program by Congress.

Mega projects are critical projects within the Corps of Engineers' portfolio that may have high investment costs, critical schedule requirements, are unique from a design/construction/procurement perspective, or have a higher level of national significance.

Flood risk is a combination of the likelihood of a natural or man-made flood hazard happening and the consequences or impact if it occurred. Flood-risk management (FRM) is one of USACE Civil Works' three core missions, alongside support for commercial navigation and restoration of aquatic ecosystems. USACE’s FRM activities seek to reduce the threat to life and property from riverine and coastal storm flooding through the development and communication of advanced knowledge, technology, and solutions.

Master plans affect the management and use of government-owned and leased lands around reservoirs and other corps-operated structures. U.S. Army Corps of Engineers regulations require master plans to be periodically reviewed to ensure they meet current public and environmental needs.