[Do enemies spawn after you complete the game?]

That is what im thinking. I Remember clearing an outpost and coming back about 1 and half or 2 hours later and it was filled with enemies again. I don't think the developers would want us to get bored after we finish. Granted there is hours and hours of things to do 

[Do enemies spawn after you complete the game?]

Do enemies spawn after you complete the game? I want to know just because i dont want to finish the game and then have nothing to do.