There’s no more helpless feeling than to have an empty rifle when the crucial moment comes to gun down the enemy. Whenever you have a moment of peace, make sure you reload and have a full clip before each skirmish.
During most missions, you won’t have to worry about using up an entire clip. However, if you like taking random potshots and go through ammunition quickly, glancing at your Ammunition Counter will let you know when you’re getting low.
When you have under ten bullets, seek out extra ammo immediately, which can usually be found in and around enemy command posts and supply stations.