RAWALPINDI (APP) - Chief of Army Staff (COAS), General Ashfaq Parvez Kayani Wednesday visited Kabul on the invitation of General Stanely A McChrystal, Commander International Security Assistance Force (ISAF) in Afghanistan, ISPR reported. General Kayani remained with Commander ISAF for sometime and discussed the matters of mutual interest. The COAS also called on Afghan President Hamid Karzai.