When the things get really messy, switch to your reliable assault rifle. If you want to survive all these, you have to use your items carefully. If you prefer to use a silent ranged weapon, use your bow to silently hunt your enemy down. Approach your enemies silently and takedown them with your trusty crowbar. For the worst case, always keep your pistol somewhere nearby. Most importantly, manage your ammunition and medkit shots wisely. Get your hands dirty with close combat if you are caught.
more information...