Shooting: As a rule of thumb, and similar to other action games, it is advisable only to shoot with short, controlled bursts of fire. This not only improves your accuracry (and thus your mission rank), it also helps you save ammunition. If you need improved accuracy, use the first person view. Your movement is much slower during first person view, however.
- In general, always reload your gun so your clip is fully maxed. This can save you precious time during crucial moments.
- Never shoot from out of the open. Always take cover behind a wall, sandbags, or a building. If all hell breaks loose, you'll ideally want to position yourself (temporarily) behind a low wall or sandbags, and behind you a building preventing easy ambushes.
- If you've escaped combat succesfully, your last known location will be shown on your iDroid as an orange circle. Enemies will be focusing their search activities around this area, allowing you to circle around a base and find the other side mostly unmanned.
Clos[Subsistence] Quarters Combar (CQC): We've already touched down on interrogation procedures, which follow the choke technique, an essential CQC maneuver that saves tranq. rounds and suppressor health. You can, however, also throw enemies (tilt the left stick in the direction you want to throw), or simply tap the CQC button when near an enemy to perform up to five hits. Alternatively you can use guards as human shields, but this is only useful in direct combat situations, and not for long. If lethal takedowns are your thing, it's possible to slit throats, but it isn't really necessary and destroys any possibility for you extracting said guard with a Fulton device at some point.
Heavy Field Equipment: You'll often encounter turrets, mortars or anti-air artillery in the field. Although these can come in handy in a full combat situation that has gotten ouf of hand *anyway*, they're not the best choice when you're aiming for a higher mission score, considering deaths have a negative impact on this. You can and should extract them later in the game when you've upgraded your Fulton extraction equipment, because heavy equipment can be used to better defend the Mother Base.
Armored Enemies: As mentioned before, depending on how you play, enemies will start wearing more protective gear. Unprotected faces can be hit with a well-landed tranquilizer dart all the same, but this is considerably more difficult. Regular handguns and submachine guns have the lowest penetration, followed by assault rifles and machine guns with somewhat better penetration (not through thick armor, but they can remove a helmet). A sniper rifle blasts right through everything but walls.