The F-111C became an export model to the only other operator of the F-111, that being Australia. Delivery of these 24 aircraft were delayed until 1973 when they had been originally ordered as early as 1963. Four of these became hybrid reconnaissance/bomber models as RF-111Cs, fitted with cameras and reconnaissance equipment while still retaining their combat strike capabilities.
The F-111D was an "improved" Aardvark featuring uprated engines, new avionics, a revised canopy and a revised air intake. Ninety-Six were delivered with operational service attained in 1974. Delayed once again hampered these deliveries, for the D-models were ordered several years prior in 1967. The F-111E became an interim model following the "breaking-in" issues encountered with the D-models. Ninety-four of these E-models arrived even before the D-models were brought fully online.
F-111F was the final production variant of the Aardvark line. Improved avionics, simplified systems and improved capabilities stemmed from this new model. The FB-111A "Switchblade" (name is unofficial) was a strategic bomb variant used in place of Boeing B-52 Stratofortresses and Convair B-58 Hustlers in service with US Strategic Air Command. Production of this type amounted to 76 examples. The F-111K was a British order intended to fill the void of the cancelled BAC TSR-2 bomber program fro 1965, with the Aardvark order itself eventually canceled by the British in 1968. The F-111G were used as trainers.
The evolution of the F-111 saw the aircraft pass through a series of first-run models that focused on increasing the performance of the Pratt & Whitney engines. Forty-two F-111A models were also converted to the famous EF-111 Raven series of electronic warfare aircraft (conversions completed by Grumman) and were utilized in the Persian Gulf War. These systems were originally designed to replace the aging Douglas EB-66 aircraft. The Raven models featured a noticeable bulb on the top of their vertical tail fins.
The US Strategic Air Command (SAC) operated their FB-111 models from 1969 through 1990 while the USAF usage covered 1967 through 1998 (the USAF batch consisting of Ravens).
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