First-year cadets proceed into the U.S. Coast Guard Academy's 134th Commencement Exercises before becoming newly commissioned ensigns, Wednesday, May 20, 2015, in New London, Conn. President Barack Obama delivered the commencement address speaking on global warming. (AP Photo/Stephan Savoia)
US Coast Guard cadets take their oath during the 134th Commencement Exercises of the United States Coast Guard Academy in New London, Connecticut, on May 20, 2015. AFP PHOTO/NICHOLAS KAMMNICHOLAS KAMM/AFP/Getty Images
US President Barack Obama arrives to deliver the keynote address during the 134th Commencement Exercises of the US Coast Guard Academy in New London, Connecticut, on May 20, 2015. AFP PHOTO/NICHOLAS KAMMNICHOLAS KAMM/AFP/Getty Images
First-year cadets raise their hands as they take the oath of newly commissioned ensigns at the U.S. Coast Guard Academy's 134th Commencement Exercises, Wednesday, May 20, 2015, in New London, Conn. where President Barack Obama delivered the commencement address speaking on global warming. (AP Photo/Stephan Savoia)
US Coast Guard cadets celebrate during the 134th Commencement Exercises of the United States Coast Guard Academy in New London, Connecticut, on May 20, 2015. AFP PHOTO/NICHOLAS KAMMNICHOLAS KAMM/AFP/Getty Images
US President Barack Obama arrives to deliver the keynote address during the 134th Commencement Exercises of the United States Coast Guard Academy in New London, Connectict, on May 20, 2015. AFP PHOTO/NICHOLAS KAMMNICHOLAS KAMM/AFP/Getty Images
US Coast Guard cadets take their oath during the 134th Commencement Exercises of the United States Coast Guard Academy in New London, Connecticut, on May 20, 2015. AFP PHOTO/NICHOLAS KAMMNICHOLAS KAMM/AFP/Getty Images
US President Barack Obama delivers the keynote address during the 134th Commencement Exercises of the United States Coast Guard Academy in New London, Connecticut, on May 20, 2015. AFP PHOTO/NICHOLAS KAMMNICHOLAS KAMM/AFP/Getty Images
US Coast Guard cadets hold their diplomas during the 134th Commencement Exercises of the United States Coast Guard Academy in New London, Connecticut, on May 20, 2015. AFP PHOTO/NICHOLAS KAMMNICHOLAS KAMM/AFP/Getty Images
President Barack Obama and Ensign Robert Huntley McConnel strike a pose after he received his diploma and commission at the U.S. Coast Guard Academy graduation, Wednesday, May 20, 2015, in New London, Conn. (AP Photo/Pablo Martinez Monsivais)
A young boy runs off with a cadet's hat after the newly commissioned ensigns tossed them into the air at the conclusion at the U.S. Coast Guard Academy's 134th Commencement Exercises during the closing procession, Wednesday, May 20, 2015, in New London, Conn. where President Barack Obama delivered the commencement address speaking on global warming. (AP Photo/Stephan Savoia)
Members of the graduating class of 2015 U.S. Coast Guard Academy throw their hats in the air near the end of their ceremony in New London, Conn., Wednesday, May 20, 2015. (AP Photo/Pablo Martinez Monsivais)