The U.S. Army Corps of Engineers, Honolulu District, is seeking letters of interest from prime contractors for a potential environmental compliance support services requirement. The work would cover a full range of environmental compliance support activities under a Fence-To-Fence Environmental Services effort for Hickam Air Force Base, Hawaii, and the Air Force Civil Engineer Center. This is a sources-sought notice for information and planning only, not a request for proposals, quotations, or bids, and it does not commit the Government to issue a solicitation or award a contract.