I don't think that RPing the army can be considered a big effort. Even more, and now talking about an RP solution to this, reservists regiments can be created so people who don't want to RP can stay at home, get their wage and defend their townhall and don't be "forced" to RP nothing more than a simple post saying "Hi, I'm a reservist". This will be consistend in both RP and IG.
No everyone wants to RP... true, but also a lot of people don't want to RP because they don't know how to start. The proposed functions will allow the militar RP players to encourage people to take that RP and start playing at 100% of the game posibilities. The other option is that IG and RP militar may depend on mayors to deliver orders and commands, and this , lets face it, dosent usually works as most of the mayors are busy enough with only their usual tasks.