The U.S. Navy Energy Conservation Award flag, which is awarded to eight Navy and Marine Corps units each year for outstanding energy conservation and energy management accomplishments during the  preceding fiscal year.  Winners can fly the flag for one year after the award announcement.  The award was originally created in the wake of the oil shortages in the 1970s.  For more information, see here, here, U.S. Navy document NTP 13(B) [1] section 1607, and SECNAVINST 4101.2 [2].
Own work
Carl Lindberg