( CNN ) -- The Pentagon on Wednesday identified two U.S. soldiers who disappeared in Afghanistan this month , announcing the death of one of the men and saying that the whereabouts of the other remain unknown . Both soldiers from the 4th Brigade Combat Team , 82nd Airborne Division disappeared in the Morghab River near Afghanistan 's border with Turkmenistan on November 4 . The Pentagon announced the death of Army Sgt . Benjamin Sherman , 21 , of Plymouth , Massachusetts . Army Sgt . Brandon Islip , 23 , remains missing . Islip is from Richmond , Virginia . Both men were on a resupply mission when they disappeared , the Pentagon said . Last week , military divers found Sherman 's body . Family members said he jumped into the river when he saw a fellow soldier struggling in the water . `` I know , that day , he jumped into the river to try to save his comrade was because he did n't just see another soldier in the water ; he saw his brother , '' Sherman 's sister , Meredith , said in a statement to CNN affiliate WCVB in Boston , Massachusetts . `` He did n't jump in because he was trained to but because that 's what his heart told him to do . ''
Two sergeants disappeared near border with Turkmenistan this month . Divers found body of one last week . Family said he jumped into river after seeing fellow soldier struggle .