I think they were certified to carry laser-guided GBUs, but didn't do so in combat. Air Force A-7Ds carried PAVE Penny pods which could detect laser designators, but AFAIK, it was only used to get the pilot onto the correct target. The aircraft itself still generally carried unguided munitions. Not sure about Navy A-7s, but Air Force A-7s were masters at pop-up bombing, which wouldn't have worked well with LGBs. A-7Ds could sneak up on a target in the weeds, pop up, hit it, and get out fast in the weeds, like no other aircraft at the time. It was amazing to watch.