Flag of the United States Chief of Naval Operations.  The position was created in 1915, but the flag just dates from 1964. It is defined in naval regulations, document NTP 13(B) [1] section 1810, as:

The personal flag of the Chief of Naval Operations consists of a blue and white rectangular background divided diagonally from lower hoist to upper fly, blue above and white below. In the center of the flag appears an adaption of the center of the official seal of the Chief of Naval Operations, consisting of an eagle clutching an anchor, all in proper colors, encircled by fifty links of gold chain. Directly above, below and to each side of the circular center design is a 5-point star with one point upward. On the blue field the two stars are white and on the white field the two stars are blue. A gold fringe is authorized for use with the flag when it is displayed in a static indoor position. The cord and tassels are of golden yellow.
For more information, see SeaFlags.
Modified from File:US-NavyReserve-Emblem.svg
U.S. Government, mostly