It's a matter of how far out from Earth orbit we'd be extending the military arm and the subsequent logistics train involved. The debate is going to swing between the pros and cons of manned versus unmanned military craft. Do we trust automated vessels to get the job done via remote control while taking time delay of transmissions into effect, or does military supremacy of space require a Mark One eyeball on the scene? Size is a major consideration as well; are we launching these vessels as is into orbit or is there an assembly area for constructing larger craft? Without taking anti-radiation shielding of a craft into account, what's the weapons/armor ratio? Any ship that wants to survive potential combat is going to be a hard hitter with lots of countermeasures to keep the opposing stuff at bay.
One idea I've been kicking around is having a pseudo-battlecarrier that can deploy unmanned point defense drones around it for defense while it engages targets.