Snipers are often deployed for specific objectives in teams consisting of snipers and observers. Hezbollah snipers later an Afghan Shiite sniper unit. The Marine Scout Sniper Course qualifies students as Marine Corps Scout Snipers. They consisted of Scout Snipers and Intelligence Marines. Artillery spotters were an especially prized target for snipers. Not all snipers are highly trained professional soldiers. This rifle was mostly used by Confederate snipers. There were reports of snipers taking potshots at rescue helicopters; these were false. Numerous Japanese snipers and camouflaged machine gun positions were also set up. Strong resistance from Japanese snipers and machine guns stalled the advance and inflicted casualties. This created easy targets for mortars and snipers. Other roles include Shocktroopers (assault infantry), "Lancers" specializing in anti-tank warfare, snipers, and engineers. Some military snipers use three-legged shooting sticks. Special military forces, including snipers, guarded the roof. Gaddafi loyalists delayed the attack with the use of their snipers.