Well, here is a response from another forum in relation to your problem:
You might have a corrupted your BF2 cache. Delete the subdirectories in your My Documents\Battlefield 2\mods\bf2\cache and bf2 will rebuild your shaders.
Looks like something left over from alpha testing. The really, the GP initials and the _DO_ do not look like they were supposed to be in the final product.
[sig]Broken due to link being older than I am (in internet years at least) and laziness[/sig]