Chief of Army Staff General Ashfaq Parvez Kayani called on Prime Minister Syed Yousuf Raza Gilani here at the PM House on Monday and briefed him about the on-going army action in South Waziristan. The meeting discussed matters relating to national security. The Prime Minister said the nation was proud of its Armed Forces and paid rich tributes to those who laid their lives for the nation, a press release issued by the PM House said.