 In the dying stages of the conflict , FRELIMO was provided with a few <unk> @-@ 7 <unk> shoulder @-@ launched missile launchers from China ; these were never used to shoot down a Portuguese plane . Only one Portuguese aircraft was lost in combat during the conflict , when Lt. Emilio Lourenço 's <unk> @-@ 4 was destroyed by premature detonation of his own ordnance . 
