The Marine Corps is a unique organization. It’s infantry is very light, compared to US Army mechanized formations, yet its supporting arms are a huge slice of its manpower and budget. By design, because shipping space is so tight, the Marine units of a landing force don’t have a lot of organic firepower. They make up that shortfall by having a lot of dedicate fire support. A key component of that, dating all the way back to the 1920s, is Marine aviation. Where doctrinally an Army unit looks to its artillery for fire support, a Marine unit looks to its aviation. Close air support as we know it today was a Marine invention, and they are past masters at it.
Oh, and for all the love of the A-10, the Marines are quite happy to perform CAS without it.
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