Defense Maritime Solutions Inc., formerly Wartsila Defense Inc., Chesapeake, Virginia; and Coastal Seal Services LLC, Lincolnton, North Carolina, are each receiving a modification (P00007) to previously awarded multiple-award, firm, fixed-price, indefinite-delivery/indefinite-quantity contracts (N3220521D4126) and (N3220521D4127) to increase the shared contract ceiling amount. These modifications will allow for continuous procurement of parts and services from the original equipment manufacturer (OEM) and authorized non-OEM sources. Military Sealift Command (MSC) requires firm, fixed-price orders to provide services and parts to maintain a broad range of seals, jet drive, propulsion systems, and associated parts supply in support of the following MSC class vessels: T-AH (Hospital); T-AKE (Dry Cargo/Ammunition); T-AO (Fleet Replenishment Oiler); T-AOE (Fast Combat Support); T-ARC (Cable Repair); T-ARS (Rescue and Salvage); T-AS (Submarine Tender); T-ATS (Tug and Salvage); T-EPF (Expeditionary Fast Transport); and T-ESB (Expeditionary Sea Base). Work will be performed worldwide, with the period of performance ending Aug. 4, 2026. The statutory acquisition authority permitting other than full-and-open competition is 10 U.S. Code 3204(a)(1), as implemented by Federal Acquisition Regulation 6.302-1(a)(2), whereby this requirement can only be fulfilled by one or a limited number of sources. A five-year ordering period with a shared contract ceiling of $33,367,845 is currently on these contracts. With the execution of the proposed modifications, the shared contract ceiling would increase by $40,123,221 to a value of $73,491,065. No funding is being obligated via these modifications, as this is an indefinite-delivery/indefinite-quantity contract, where funding is obligated at the order level. Funding for the fiscal year in which orders are placed will be utilized at the time an order is executed. MSC, Norfolk, Virginia, is the contracting activity.