This is a sources sought notice for market research only; no proposals are being requested or accepted, and no contract will be awarded from it. The agency seeks capable firms to provide Travel Management Office support for the Defense Travel System and Government Travel Charge Card, plus Mail Management Center technical and administrative support for Strategic Systems Programs. The anticipated contract is Firm-Fixed-Price, Level-of-Effort, Term Contract CLIN support with a five-year ordering period from May 10, 2027 through May 9, 2032. Support includes travel program management, help desk support, travel auditing and analysis, GTCC administrative support, and official mail handling operations.