Face reflects light differently to others I'm currently working on a Stryker, i'v came across a problem which make it so one of the faces reflects light differently than all of the others.

Thanks to anyone who helps/attempt's to help :D
Here is a picture of it
This is a problem related to the normals.  To correct it, go into edit mode and select everything. (This can be done by pressing A once or twice.)  Then, click Shading/UVs > Normals > Recalculate.  If this does not work, select the single face and click Shading/UVs > Normals > Flip Direction.