Official caption:
With a loaded M2 .50-caliber machine gun close at hand, one crewman reads a book while another keeps watch off the stern as their PB Mark III patrol boat cuts through the water of the gulf. This patrol boat is among the Navy assets operating in support of efforts to provide security for US-flagged shipping in the Persian Gulf.
U.S. Navy Photo 330-CFD-DN-ST-89-08778 by PH1 Smith, labeled 1/1/1989
Now go grab a book, you heathen.