BASIC KEY COMMANDS

ORDERS
F1 = "Move UP" Orders your squad to move up forward of your position.  Allows you to provide cover fire.
F2 = "Follow Me" Orders your squad to return to column formation behind you, effectively a "follow me" command.  Useful to move through constrained positions such as buildings and ravines.
F3 = "Hold Up" Orders your squad to hold their positions.
F4 = "Hit The Dirt"  Posture command.  Hit the key once and entire squad will crouch, hit it again and they will go prone.  Hit this key again and everyone will stand.

CAMERAS
F5= 3rd person view
F6 = 1st person view
F7 = Binoculars
F8 = Night Vision  (if you selected a Night Vision Scope in your load out)
F9= Scope and infrared scope(the amount of magnification depends on the scope selected at load out. Note: not all weapons can use a scope.)
F10 =Map mode (use numeric keypad to scroll and zoom in/out)
F11 = toggles between red Laser designator and yellow 2D reticle and no pointer
F12 = drop camera (the camera will move once the character is out of view)

TARGETING

For the most "traditional" shooting game -style camera, use the yellow crosshair
For the most "realistic" camera, use the laser dot

MOVEMENT
Numeric Key Pad
8 = move fast forward
5 = move slow forward
2 = move backward
4 = turn left
6 = turn right
0/Ins = "running strafe" left (hold down fire button to fire)
./Del = "running strafe" right (hold down fire button to fire)
7 = sidestep strafe left (hold down fire button to fire)
9 = sidestep strafe right (hold down fire button to fire)
1 = lean left (hold down fire button to fire)
3 = lean right (hold down fire button to fire)
+ = zoom in (3rd person only)
-  = zoom out (3rd person only)

A = stand up
Z = lie down

MISC
F = turn flashlight on/off
Left Alt = toggles alternate fire (OICW and M203) switches between grenade and rifle
TAB = switch to other "buddy" if still alive or available
Left Click = fire
Right Click = issue buddy commands 
L = hold down and move mouse to move 3rd person camera wherever you
want
1-4 change weapons
- = "widescreen" adjustment
+"widescreen" adjustment
SPACE = open door/activate switch
[ and ] = cycle through inventory, then hit RETURN to activate/use/throw
item
D = drop select item
P = pick up item on ground (note: must be facing item and within 2 feet of it)
RETURN = use inventory item (throw grenade for example)
R = Reload weapon

MULTIPLAYER
S = displays stats in multiplayer (kills, lives remaining and team)

MOUSE
Left Click = fire selected weapon
Right Click = brings up Buddy Control GUI (see below for more info)
Mouse Up = look up
Mouse Down = look down
Mouse Left = look left
Mouse Right = look right


NOTE: You can reassign all of these keys in the Options menu.