so the last couple of times i have played, i was trying to use my mortar strike and when i went to go place it down it still shows up red and i cant put it down anywhere. doesn't matter flat surface or not. so since the patch did they make it so i have to unlock it again or something. is there something i have to do again so that i can use it. because i have seen other people use it in the same game as me so i must be missing something?