New heavy cruisers of the Salem class have Gun Directors Mark 54, which differ from the Mark 34 in having more complete provisions for control of the main battery against aircraft. The accompanying rangefinder is the Mark 66.
The Salem Class main battery fire control computers are Mark 1Able with cams cut for the 8"/55 rapid fire guns. These computers compute both surface and AA ballistics for the 8"/55 rapid fire guns. Thus no change is needed in the fire control system in firing at either surface or air targets.
