Lithuanian and Polish Naval Special Operation Forces divers perform underwater dive training at Plateliai Lake located in Plateliai, Lithuania during the Jackal Stone 10 exercise. (U.S. Army photo by

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Lithuanian and Polish Naval Special Operation Forces divers perform underwater dive training at Plateliai Lake located in Plateliai, Lithuania during the Jackal Stone 10 exercise. (U.S. Army photo by Pfc. Christopher A. Calvert - photo approved for public release by SOCEUR PAO - MAJ James Gregory)