To destroy enemy emplacements, other weapons were employed, including the 37 mm (1.46 in), 60 mm (2.5 in), and 89 mm (3.5 in.) "Lança-granadas-foguete" (Bazooka), along with several types of recoilless rifles. Because of the mobile nature of counterinsurgency operations, heavy support weapons were less frequently used. However, the m/951 12.7mm (.50 caliber) U.S. M2 Browning heavy machine gun was used in ground and vehicle mounts, as were 60mm, 81mm, and later, 120mm mortars. Artillery and mobile howitzers were used in a few operations.