Seiko watches have a long history with the Special Operations community, specifically their dive watches, which were favored by members of Naval Special Warfare units. While Tudor Submariners were common during the Vietnam War and issued by some Teams into the 1980's, Seiko Divers were standard issue for the SEALs from the 1970s until the mid-1990s.
With the Rolex and Tudor Submariners of old all but phased out and either retained by crafty SEALs or sold at DRMO auctions, the SEAL Teams of the 80s and 90s issued a mix of SEIKO automatic dive watches including the 6309 and later the 7002 as well as several generations of the venerable Casio G-Shock and Pathfinder.