The group improved rapidly in the early 1990s, progressing from losing five fighters for every Israeli soldier killed in 1990 to 1.5 in 1993, a ratio that would roughly hold till the end of the decade. Hezbollah ended human-wave attacks in 1990 and began conducting attacks with two units: an assault team and a fire support team with 81 mm mortars. Accumulating combat experience was critical to this improvement in tactical proficiency, and by the early 1990s Hezbollah attacks were "characterized by careful planning and well-practiced professionalism." Hezbollah in the early 1990s performed dedicated staff work, mirroring their Israeli adversaries. Improved intelligence and reconnaissance abilities were also major drivers of better overall fighting ability. In 1992, Hassan Nasrallah took control of Hezbollah, and he is generally considered to have provided strong leadership. During the late 1980s and early 1990s, the party refocused on quality over quantity, substantially improved training, and also accumulated more weapons: by the early 1990s, they "had amassed a significant arsenal." Their small arms at this time included AK-47 and M16 rifles, Bangalore torpedoes, hand grenades, RPGs, and M40 recoilless rifles. Iran was largely responsible for this arms increase and flew planeloads of weapons and ammo into Damascus every month. Hezbollah introduced full combat uniforms in the early 1990s and improved their small-unit tactics and field security.