Rangers march during celebrations to mark the country s Defence Day in Lahore on September 6, 2015. PHOTO: AFP

Members of Pakistan's air force march past the mausoleum of Muhammad Ali Jinnah during Defence Day ceremonies in Karachi, Pakistan, September 6, 2015. PHOTO: REUTERS

Special demonstration by Pakistan Navy SSG and Pak Marines at Sea View, Karachi in connection with golden jubilee celebrations of Defence Day. PHOTO: PAKISTAN NAVY

Pakistan Air Force women cadets march next to the mausoleum of Mohammad Ali Jinnah to mark the country s Defence Day in Karachi on September 6, 2015. PHOTO: AFP

Troops take part in a drill during celebrations to mark the country s Defence Day in Lahore on September 6, 2015. PHOTO: AFP

Air Vice Marshal Aasim Zaheer (3rd R), Air Officer Commanding, Pakistan Air Force, walks with officers to lay a wreath at the mausoleum of Muhammad Ali Jinnah during Defence Day ceremonies in Karachi, Pakistan, September 6, 2015. PHOTO: REUTERS

PHOTO: REUTERS

PHOTO: AFP

A glimpse of the Pakistan Navy's parade during a special ceremony held at PNS KARSAZ on September 6, 2015. PHOTO: PAKISTAN NAVY

PHOTO: AFP

PHOTO: REUTERS

Special demonstration by Pakistan Navy SSG and Pak Marines at Sea View, Karachi in connection with golden jubilee celebrations of Defence Day. PHOTO: PAKISTAN NAVY

PHOTO: AFP

Jets perform during the celebrations to mark the Defence Day at the Nur Khan military airbase in Islamabad on September 6, 2015. PHOTO: AFP

A large number of people watch a F-16 fighter jet perform during the celebrations to mark the Defence Day at the Nur Khan military airbase in Islamabad on September 6, 2015. PHOTO: AFP

A F-16 fighter jet performs during the celebrations to mark the Defence Day at the Nur Khan military airbase in Islamabad on September 6, 2015. PHOTO: AFP

Jets perform during the celebrations to mark the Defence Day in Islamabad on September 6, 2015. PHOTO: AFP

Prime Minister Nawaz Sharif offering fateha at the monument of Major Raja Aziz Bhatti Shaheed Nishan-e-Haider at the bank of BRB Canal near Barki Road on September 06, 2015. PHOTO: INP

General Officer Commanding Major General Fida Hussain Malik along with family members of Major Shabbir Sharif Shaheed, Nishan-e-Haider, offering fateha at his grave at Miani Sahib graveyard on September 06, 2015. PHOTO: INP

Pakistan's JF-17 Thunder fighter jet performs during a ceremony marking the Defence Day in Islamabad on September 6, 2015. PHOTO: REUTERS

A F-16 fighter jet performs during a ceremony marking the Defence Day in Islamabad on September 6, 2015. PHOTO: REUTERS

A F-16 fighter jet performs during a ceremony marking the Defence Day in Islamabad on September 6, 2015. PHOTO: REUTERS

Spectators watch a performance by jets during a ceremony marking the Defence Day in Islamabad on September 6, 2015. PHOTO: REUTERS

Paratroopers perform during a ceremony marking the Defence Day in Islamabad on September 6, 2015. PHOTO: REUTERS

Students of Army Public School (APS), which was attacked by Taliban gunmen in 2014, hold national flags as they take part in a ceremony marking Pakistan Defence Day in Peshawar, Pakistan, September 6, 2015. PHOTO: REUTERS

Women take a selfie while visiting an exhibition organised by the Pakistan Air Force (PAF) in Peshawar, Pakistan, September 6, 2015. PHOTO: REUTERS

Celebrations for Defence Day started with a 31-gun salute in the federal capital and 21-gun salute in provincial capitals.In Karachi, the day started with the change of guard ceremony at Quaid-e-Azam’s mausoleum where contingents of cadets of PAF assumed charge.Here are some pictures from the ceremony at Quaid-e-Azam’s mausoleum: