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/TIPS 5.0  \
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1) Always, always, always use the gun's sights when you're not moving.  The 
   accuracy increase is incredible with most automatics, and with the already
   accurate rifles you'll get a small zoom to encourage sniping.  Ammo isn't
   too much of a problem in this game, but clip sizes are, so do your best to
   make those shots count.

2) Crouch or prone behind cover whenever possible.  The smaller the target you
   present to enemies, the less you'll be shot.  Enemies will eventually start
   throwing grenades to dislodge you, so always be prepared to relocate.

3) Speaking of grenades, they aren't too useful out in the open due to the
   difficulty of aiming them.  Indoors is an entirely different matter as there
   are walls and piles of junk and such to stop the grenade somewhere close to
   where you want it.  This occasionally applies outdoors as well, when a few
   Germans are hiding in those little alcoves scattered throughout the game.

4) Regarding your AI allies, there are three different kinds you need to
   distinguish.  First is the cannon fodder, the ones who run around, kill 
   enemies, and die.  Second are plot soldiers, who are much more useful than
   the regular guys because they're invincible (they still take damage, but
   won't actually die unless the game specifically wants them to).  These are
   the ones you'll want to charge into rooms and around corners for you.  Third
   are objective soldiers (or tanks).  These are distinguished by an objective
   stating "X must survive" and have a health bar on the upper-right corner of
   the screen.  These are also the only soldiers you should expend first aid
   kits on, for rather obvious reasons.  I'll point out any plot or objective
   soldiers during the walkthrough.

5) I generally save first aid kits until my health is down to about 33%.  Any
   less runs the risk of getting killed before I can heal, any more and I start
   feeling pretty stupid if and when I come across a health kit.  Some levels,
   though, are hard enough to warrant using them at closer to 50%.  You'll have
   to play the game a bit to find a system most comfortable to you.

6) Sort of goes without saying, but be sure to duck behind a building or
   something to let your green health bar recharge while in a tank.

7) Health kits and first aid kits will remain in the place where you found them
   until the level ends, so feel free to backtrack if necessary.

8) Regarding weapons, it's generally best to have a long range rifle and short
   range automatic on your person.  This way, you can effectively handle any 
   situation that may arise.  I'm going to assume this will be your MO during
   my walkthroughs, so you may have to adjust things a bit according to your
   personal preferences.

9) Try to let allied soldiers bear the brunt of, well, everything.  99% of them
   will either be quickly replaced or can't be killed at all.  Sure it's cheap,
   but it keeps you alive and armed, and that's what matters most game wise.