Army Sgt. 1st Class David Palczewski, center, teaches a group of cadets from the U.S. Coast Guard Academy how to handle hand grenades before participating in the 2016 Sandhurst competition at the U.S. Military Academy, West Point, N.Y., April 7, 2016. Palczewski is assigned to the 3rd Battalion, 304th Infantry Regiment, 104th Training Division. The cadets are assigned to the U.S. Coast Guard Academy. Army photo by Sgt. 1st Class Brian Hamilton