[johndallman]

Given nanofabrication, the society needs matter, which it presumably gets from moons, asteroid belts and other shallow gravity wells, and energy. Is that fusion, solar, or what? Can a primary power source be small enough to carry? Without that, simply running an opponent's power supply down seems to be a good tactic.

What is there in the way of computing, AI and robots?

Presumably there are social controls on using large enough explosions to just kill someone through the DR of a personal barrier? Using a lot of small explosions or a machine gun to chew through the ablative DR looks very possible at present.