NATO commanders in Afghanistan say the battle against Taliban insurgents is being held back by restrictions placed by alliance nations on what their troops can do on the ground. A NATO summit starting in Riga on Tuesday will aim to do away with many such restrictions, known as “caveats”. Following are examples of limits that apply to some of the 37 national contingents within the 32,000-strong NATO-led International Security Assistance Force (ISAF), according to NATO sources. Full Story