Clients Clients O’Riordan Bethel proudly serves commercial and Government clients. We have worked with more than ten (10) different federal agencies, including the GSA, DNFSB, Army, Navy, USDA, DOE, DOJ, DOI, NEA and NSA. Army, Mission & Installation Contracting Command Department of Justice DC Office of the Attorney General General Services Administration National Security Agency Department of Agriculture DC Department of Public Works Defense Nuclear Facilities Safety Board Joint Base Andrews Navy, Office of Naval Research Department of the Interior DC Department of Transportation National Endowment for the Arts