 Tube artillery could fire in any conditions (bad weather, day, or night), and the 1st Cavalry Division ended up having a 155mm howitzer battery (1st Battalion, 30th Artillery) attached to the division in Vietnam to provide medium artillery support in situations when ARA might not be able to fly.The 1st Cavalry Division locally designed and produced slings, allowing the 155mm guns to be moved by their heavy CH-54 "Flying Crane" helicopters.When the 101st Airborne Division converted to an airmobile unit, the 2nd Battalion, 11th Artillery (155mm) was similarly attached.