 A firing battery was equipped with 12 attack helicopters.Initially the units were supplied with Bell UH-1B and UH-1C model helicopters, but these were replaced with the newer AH-1G HueyCobra as they became available.According to one historian's authoritative account of the First Cavalry Division's actions in Vietnam, the conversion to Cobras gave the 2/20th ARA "the firepower equivalent to three conventional artillery batteries."