Pacific Horizon 2017 is a Maritime Prepositioning Force (MPF) exercise designed to train I Marine Expeditionary Force (MEF) and components of Naval Beach Group 1 (NBG-1) Marines and Sailors on arrival and assembly operations as well as follow-on Marine Air Ground Task Force actions to ensure that the right equipment, supplies and tools get to the right people to be employed in crisis response, humanitarian assistance or amassing combat power ashore from sea.