okay first off SFOD-D stands for Special Forces Operational Detatchment-Delta, in other words Delta Force, which is different than 1st SFG (ABN), unless Delta falls under 1st group ( which it may, but i don't think so) then they have a different "flash".
But here is what the first groups flash looks like.. PS this flash is from 1964-present
1st SFG(A) Beret Flash