Answer:
No, you can't. Please read the minimum system requirements.

Answer:
The following list of video settings are current as of release 2.2...

Reduce Mouse Lag (default true). This is a setting that improves synchronization between your graphics display and mouse, but at the expense of maximum frame rate. Try turning this setting off to improve performance, but if you notice jerky control issues, you'll have to leave it on.

Use Precaching (default true). When true, the game will load many textures before gameplay begins, before the textures are actually needed. This may result in loading textures that you don't need (like the textures on the sewer grates, even though you never enter the sewers). Setting this value to false means that textures are loaded during gameplay, only once they're needed -- which can result in a stutter while the card waits for the textures to arrive. If you have a graphics card with 32MB of memory or less, it might be worthwhile to turn off precaching to avoid filling your scarce graphics memory with unneeded resources.

Use Trilinear (default true). Mipmapping is a technique for antialiasing textures with multiple levels of detail. (Mip stands for multum in parvo, Latin for "many things in a small place". Cool, eh?) A mipmapped texture supports many different levels of detail. Normally, a level of texture detail is selected based on how far away the texture is to be drawn. Then, the texture value for each pixel is bilinearly interpolated, meaning across the 2D texture. That's nice, but you generally only have a few levels of texture detail; for a given distance to a surface, one level of detail might be too low in resolution, but the next one might be too high detail. Trilinear interpolation bilinearly determines the right color for the two levels of texture detail that are the closest to correct, and then blends those together depending on which one is most desired at that distance. What's that mean to a game player? Trilinear interpolation has two access two different mipmap detail levels for the same pixel, so on some hardware this is twice as expensive as bilinear interpolation. If you have a low-end graphics card, turning off trilinear mipmaps can provide some performance gains at the cost of texture blurring and popping.

Use Triple Buffering (default false) coming soon.

Use Cubemaps (default true): Some reflective surfaces in the game, like scopes and monitors, have cubemapped environment textures. This is a way to fake the backdrop of the environment, so that it feels like you are seeing a reflection on the surface. (Rendering reflections in real-time is very expensive; that's why the mirror in the Pipeline map is in a small room.) A cube map is a set of six textures that emulates the world with what amounts to a big box around the object; each wall of the cube has a picture of the world in that direction. Turning off cubemaps won't affect gameplay at all, and will improve performance slightly.

Use Compressed Lightmaps (default false): America's Army: Special Forces uses precomputed shadows for BSP surfaces such as walls and floors. This speeds up rendering time during gameplay signicantly, at the cost of less flexibility with real-time dynamic shadow effects. Lightmaps are just black and white textures that are drawn onto the surface, to emulate shadow lines. This means they take up texture memory, which can be a performance hit on low-end cards. We include a compressed version of the lightmaps with each map; turning on this feature will use those low-detail lightmaps, which aren't as crisp and show some subtle color artifiacts. If your card is having texture memory problems (especially in complex mission environments in multiplayer) try turning on compressed lightmaps.

No client side effects (default false): This turns off certain client-side features like bullet shells, gun sounds, muzzle smoke, bullet impact effects, and the like. It doesn't let you turn off features that might affect gameplay, like smoke grenades. Turn this on if you absolutely have to, if your computer is having trouble keeping up with the game. It sure reduces the fun of the experience.

Texture detail (default High): Many game textures support multiple levels of detail (through mipmaps, discussed above). Setting texture detail to Low will force the game to use lower detail mipmaps than it would otherwise select. Textures will appear blurred, especially those on surfaces near the camera. However, on graphics cards with 32MB or less memory, switching to low detail textures can significantly improve performance.

Answer:
No, you can't. Please read the minimum system requirements.

Answer:
This list is subject to change...

Supported Cards:

Nvidia GeForce2 MX series (32MB version unsupported)

Nvidia GeForce2 Pro

Nvidia GeForce2 Ultra

Nvidia GeForce3

Nvidia GeForce3 Ti series

Nvidia GeForce4 MX series

Nvidia GeForce4 Ti series

Nvidia GeForce FX series

Nvidia Quadro4 750 XGL

Nvidia Quadro4 980 XGL

Nvidia Quadro FX series

Nvidia GeForce 6800

Nvidia GeForce 7800

Matrox Parhelia based video cards

ATI Radeon 7500

ATI Radeon 8500

ATI Radeon 9000

ATI Radeon 9100

ATI Radeon 9200

ATI Radeon 9500

ATI Radeon 9600

ATI Radeon 9700

ATI Radeon 9800

ATI Radeon X850

ATI Radeon X800

ATI Radeon X700

ATI Radeon X600

ATI Radeon X550

ATI Radeon X300

Mobile Video Cards

Nvidia GeForce4 440 Go

Nvidia GeForce4 460 Go

Nvidia GeForce4 4200 Go

Nvidia GeForce FX Go series

Nvidia Quadro4 500 Go GL

Nvidia Quadro FX Go series

ATI Mobility Radeon 9000

ATI Mobility Radeon 9200

ATI Mobility Radeon 9600

ATI Mobility Radeon 9100 IGP

ATI Mobility FireGL 9000

ATI Mobility FireGL T2

Answer:
No.