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Few of the original Combat Lancer AC had a missile trapeze in what is used in later models as a bomb bay.
The missiles itself were unreliable back then.
All F-111As did not use a bomb bay. They had the troublesome gattling gun housed in that part of the fuselage.
All MK82s & M117s were loaded on MER / wing pylons.
Later FB-111A had SRAM load ability in both wing load and bomb bay. (got the pics)
The RAAF F-111C arrived at Amberley in 73 with the gattling gun but it was soon removed, never used.