Guy Gardener wrote:
Although we learnt in DS9 that all security/defense forces in the federation for every member world is Starfleet.
No, not really. We just saw that Admiral Leyton used his considerable influence (and the fact that Jaresh-Inyo was such a pushover) to get Starfleet troops on every street corner. And of course that they didn't want to create new uniforms that they weren't ever going to use again.
I'm sure that United Earth security forces could have been 'federalized' to deal with the crisis (in fact, they were actually going to show that, but it got cut for time).
Actually I believe that there has been onscreen mention of Federation member worlds retaining their own militaries for purely local matters. Most of them would indeed be absorbed into Starfleet, but not all.