ATLANTIC OCEAN (Dec. 18, 2021) Sailors assigned to the San Antonio-class amphibious transport dock ship USS Arlington (LPD 24), test the countermeasures washdown system on the flight deck, Dec. 18, 2021. The Kearsarge Amphibious Ready Group and 22nd Marine Expeditionary Unit (ARGMEU) is underway conducting an Amphibious Ready Group/Marine Expeditionary Unit exercise (ARGMEUEX). (U.S. Navy photo by Mass Communication Specialist 1st Class John Bellino)