Storage of decommissioned nuclear submarines in ports near Murmansk became a significant issue, with the Bellona Foundation reporting details of lowered readiness. Naval support bases outside Russia, such as Cam Ranh Bay in Vietnam, were gradually closed, with the exception of the modest technical support base in Tartus, Syria to support ships deployed to the Mediterranean. Naval Aviation declined as well from its height as Soviet Naval Aviation, dropping from an estimated 60,000 personnel with some 1,100 combat aircraft in 1992 to 35,000 personnel with around 270 combat aircraft in 2006. In 2002, out of 584 naval aviation crews only 156 were combat ready, and 77 ready for night flying. Average annual flying time was 21.7 hours, compared to 24 hours in 1999.