Vertical delivery training MSU Port Arthur, a photo by U.S. Coast Guard on Flickr. HOUSTON – Lt. j.g. Greg Hersh, chief enforcement officer at Marine Safety Unit Port Arthur, gets lowered down from an MH-65C Dolphin helicopter onto the deck of the motor vessel Cape Taylor during vertical delivery training, Jan. 24, 2012. VDEL training allows Coast Guard law enforcement teams to board commercial vessels underway from a helicopter and it provides another avenue should sea or other conditions present [...]