increment max(force) 1
repeat for every 1 selections of Troops in force (recursive)
repeat for every 1 selections of Fast Attack in force (recursive)
repeat for every 1 selections of Heavy Support in force (recursive)
repeat for every 1 selections of HQ in force (recursive)
repeat for every 1 selections of Flyer in force (recursive)
repeat for every 1 selections of Elites in force (recursive)