Fire support for Claret operations was mostly provided by artillery and, if the target was close to the border and in range, infantry mortars. These were sometimes moved to temporary positions in the border area. The mortars changed from 3-inch to 81mm with double the range around the end of 1965. Aircraft were not allowed to cross the border. A UK or Australian frigate was the 'guard ship' at Tawau at the eastern end of the border and an artillery amphibious observation party was available to control its fire, however it does not seem to have fired in support of Claret operations.