Don't forget that there could be a real-world LAV 75... actually the LAV 76. The 76mm OTO Melara Naval Cannon has a turret that can be fitted to an AFV. The US could have copied the idea with surplus 76mm OTO Melara's. This may have been initially deployed as a heavy AA self-propelled Gun and then pressed into service as a "bunker buster" when AFVs become scarce.
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