"As part of their mission, certain agencies have specific authorities provided under law which authorize them to use property in the case of emergencies or to assist in disaster relief. Agencies may be directed by the President or FEMA to provide personal property to support emergency relief. (See the Robert T. Stafford Disaster Relief and Emergency Assistance Act, as amended by Public Law 106-390, October 30, 2000, attached)(44 CFR 206.5). Agencies may use federal personal property to prevent loss of life or property even if the items were not acquired for this purpose. (FPMR 101-25.100)."
Dept. of Health and Human Services: http://knownet.hhs.gov/default.htm