I wont to know if theres a limit to the armed forces of tropico i presume so because theres a cap of population

I suppose the only limit is how many you can support. Soldiers take a high wage and you need 1 general to support every guard post which in turn supports 3 soldiers. The generals live in the armoury which houses 3 of them. Generals also have high pay. Guard posts and armoury's require upkeep.

I have never really found it necessary so far to have more then 20ish soldiers and generals.