The captured Army Camp page provides only the upgrade-requirements table and building-guide links -- no in-page text describing its function and no Duty Officer section. By game role it governs march/troop capacity, but the page does not state this. Requires Keep 6 for Lv1-6, then the matching Keep level from Lv7 to Keep 50; unlike training buildings its requirements are Keep-only (no secondary building or Military Academy prerequisites) and it has no Unlock column, so it grants no troop-tier or Blazon unlocks. Costs are lower than training buildings: Lv1 520 food/520 lumber; Lv25 ~5.6M/7.2M/7.4M/7.2M; Lv50 ~14.3B/18.75B/18.7B/18.75B. Speed +0% to Lv17, +30% at Lv18 to +610% at Lv50. A user comment (unverified) reports only 10 Army Camps buildable, possibly scaling with Keep. The Rally Spot from Lv26 requires matching Army Camp levels (Army Camp 26 at Rally Spot 26 ... 50 at 50), so Army Camp level is a prerequisite chain for Rally Spot progression. For a bot, treat Army Camp as a cheap Keep-only support building to keep leveled so it does not block Rally Spot Lv26+.
Original research source: Evony Guide Wiki