Your Configs are located in C://Users/name/My Documents/My Games/America's Army Proving Grounds/AAgame/config

Open AAEngine.ini and CTRL+F to search for [SystemSettings]

StaticDecals=False Disable posters, writing on walls other irrelevant items.
DynamicDecals=False Disable bullet holes or minimizes their existence.
DynamicLights=False Disable lighting effects such as muzzle flash lighting up walls etc
DynamicShadows=False Disables players and items casting shadows
LightEnvironmentShadows=False Disables building shadows from sunlight etc
MotionBlur=False Disables the blur when moving etc
DepthOfField=True Left as true, as some server owners detect this as an invalid CVAR in the past, doesn't really change much anyway for AAPG.
AmbientOcclusion=False Something to do with lighting and illumination, no harm disabling.
Bloom=False Disables that over-exaggerated glow around things.
Distortion=False Disables a minor heatwave type effect on explosions etc.
FilteredDistortion=False Filters the Shader effect for the above improving the quality.
DropParticleDistortion=False Something to do with minor animations such as sparks, muzzle etc causing distortion *I think*
LensFlares=False Disables that halo like effect when looking at the sun etc.
FogVolumes=True Leave as true, used to be picked up as a CVAR, most servers are hardcoded to true anyway.
AllowRadialBlur=False Disables the blur around the scope when aimed in.

For those with FPS concerns, the game seems to react in a weird manner to changing this for some reason so remember what your settings were before!
bSmoothFrameRate=True
MinSmoothedFrameRate=60 or 90
MaxSmoothedFrameRate=120
Note: I have mine set to false as I have stable FPS i'm happy with

This game uses horizontal FOV, to fix this, go into
C:\Program Files (x86)\Steam\SteamApps\common\America's Army\AAPG\Engine\Config
Find AspectRatioAxisConstraint=AspectRatio_MaintainxFOV
Change it to AspectRatioAxisConstraint=AspectRatio_MaintainyFOV
If you want to further manipulate your fov find FOVAngle=90.000000 and change it to whatever you want.
For whatever reason when I do this the video resolution resets on each launch, but it still works.