hangar and helicopter platform for the operation of four Sea King helicopters. The Italian s and , French and Soviet helicopter cruisers were built from the keel up as guided missile cruisers forward and helicopter carriers aft. and her unnamed sister ship (which was never funded) were originally planned as modified s, to be built as helicopter destroyers (DDH), provided they would not cost more than a standard Spruance class. Litton-Ingalls completed sketch design work for Hayler, which moved the helicopter deck aft, stretching the length of the hangar and displacing the Sea Sparrow launcher to the top of the hangar. The design would have accommodated two SH-3 Sea Kings or four smaller SH-60 Seahawk or SH-2 Seasprite helicopters. While the prospective Hayler probably would not have cost much more to build than a standard Spruance class, the detail design and engineering work required before the ship could be built would have been substantial (similar work for the cost $110.8 million). This raised the cost of the DDH substantially above a standard Spruance-class destroyer. While this additional cost might have been justified if the DDH was going to enter series production, it was difficult to justify for a single ship. Accordingly, the Navy built Hayler to the same design as the rest of the Spruance class. Interdiction Assault Ship In 1980, there was a proposed “Interdiction Assault Ship” (IAS) conversion for the Iowa-class battleships that would have removed the aft main gun turret. This would free up space for a V-shaped ramped flight deck (the base of the V would have been on the ship's stern, while each leg of the V would extend forward, so that planes taking off would fly past the ship's exhaust stacks and conning tower), while a new hangar would be added with 2 elevators, which would support up to 12 Boeing AV-8B Harrier II jump-jets. These aviation facilities could also support helicopters, SEAL teams and up to 500 Marines for an air assault. In the empty space between the V flight deck would be up to 320 missile silos accommodating a mixture of Tomahawk land attack missiles, ASROC anti-submarine rockets and Standard surface-to-air missiles. The existing 5-inch gun turrets would be replaced with 155-millimeter howitzers for naval gunfire support. These modifications would have required significant time and funding to achieve so it was never carried out, furthermore the Department of Defense and the Navy