15th Fighter Group flew some close support for the Marines when they first got to Iwo. They didn't go very far with them, but they carried 1000 pounders. A 15th FG P51D getting the bomb sway braces tightened before a mission from Iwo in April 45.
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The problem I have with the 1,000lbers in AH is that they are carried to the effective exclusion of all other bombs (on fighters allowed to take them) when in reality they were very rarely carried by fighters. In particular it makes the apparent capability of Axis aircraft look much worse than it was in reality. In practicality the Fw190, Ki-84 or N1K2-J roughly carried the same bombload as Allied fighters, but in AH people just see them as less than half as effective. Two 250kg bombs on a Ki-84 compared to two 1,000lb bombs and six rockets on a P-51D or two 1,000lb bombs, one 500lb bomb and eight rockets on a P-47 or two 1,000lb bombs and eight rockets on the F6F-5 when those Allied loadouts never, or almost never, happened in reality.