This will add some extra flavor to the game.
Each country will have equal number of POW camps. These camps would be like something similar to a strat system. The POW camps would be used for increasing and decreasing morale for each country.
When one country liberates an opposing country's POW camp, that camp switches to the country that liberated it. That liberation will increase the morale of that country that liberated it. The country that loses the POW camp loses morale.
Morale would be used to increase or decrease a country's rebuild time for destroyed objects. At the start of a new map, each country has 100% morale. 100% morale will be the arena settings for the map. The higher the morale, the quicker for hangars, strats, guns, and buildings to re-generate. The lower the morale, the longer the rebuild time.