29 September USA Today - Nations Limit Use Of NATO Forces by Jim Michaels.

Countries sending their troops to Afghanistan have placed a web of restrictions on how they can be used, creating headaches for combat commanders and hurting the coalition's ability to fight a resurgent Taliban.

The restrictions, also called caveats, vary and are imposed by governments who fear casualties or don't agree with all parts of the mission. Other caveats are due to a lack of training or equipment.

The result is some forces can't fight at night or in the most dangerous parts of Afghanistan...

Some restrictions

Germany (2,300 troops): No combat.

Netherlands (1,400 troops): No ground combat.

Others (identities classified by Pentagon): No night fighting.