system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Trek] What will it take for Starfleet to create a dedicated military arm?

With wars with the Dominion, Klingons, Cardassians, Borg etc. At what point does Starfleet decide they need a proper fighting force?
gpt
Don't they already have one? 

I mean sure their ships are almost all science vessels but they also have world destroying super weapons on them. They also have defiant class ships and fighter wings that were using during the Dominion war. 

As for an army they do have the Security wing of the command chain and all Starfleet graduates, even in the Science wing, are trained in weapons and battle tactics.