The reassessed winner of the Grounds Maintenance services at the Annapolis and Loudon Park National Cemeteries is Hangar 4 Services. -- S208 The reassessed winner of the Grounds Maintenance services at the Annapolis and Loudon Park National Cemeteries is Hangar 4 Services. Post a successful GAO protest, the government reassessed its decision of the winner for Grounds Maintenance Services at the Annapolis and Loudon Park National Cemeteries. The new is Hangar 4 Services, Inc. The offer submitted to the government is $1,136,240.00.