Tori Larned, a lifeguard, watches over the Quantico 50M Pool aboard Marine Corps Base Quantico on May 27, 2014. The pool opened for the season during Memorial Day Weekend, offering patrons enhanced amenities and more swim sessions. - Tori Larned, a lifeguard, watches over the Quantico 50M Pool aboard Marine Corps Base Quantico on May 27, 2014. The pool opened for the season during Memorial Day Weekend, offering patrons enhanced amenities and more swim sessions.