During the 1950s and early 1960s, the regular army and the national guard were both small and of roughly equal strength. The guard suffered when the army's expansion was given priority, but in the 1970s the decline was reversed when the guard was converted to a light mechanized force with the help of United States advisers. Initially consisting of four combined arms battalions, the active-duty component had by 1992 been enlarged to two mechanized brigades, each with four infantry battalions, an artillery battalion, and engineering and signals companies. The guard's mobility over desert terrain was assured by 1,100 Commando V-150 armoured cars. Firepower came from 105 mm and 155 mm towed howitzers, 106 mm recoilless rifles, 90mm guns and BGM-71 TOW platforms. In the 1990s, the V-150s were replaced in the mechanized battalions with over LAV-25 Family of Vehicles bought from DDGM/GD in Canada.