During the Kosovo War the boats, along with the rest of the navy, did not sail out to attack the NATO ships engaged in the campaign because of the huge disparity of forces and the threat from NATO aviation. They were under orders to launch a missile attack if favorable conditions presented themselves, but they never did, since the NATO ships never approached the Yugoslav shores much closer than the maximum range of the boats' missiles. The boats took self-preservation measures such as camouflage, changing berths often and hiding in the submarine pens in the Bay of Kotor, to make it more difficult for the NATO aviation to target them (which, ultimately, it never did). They also contributed to air defense with their weaponry on several occasions with RTOP-405 shooting down a UAV near Risan on 1 June 1999 with her Bofors gun.