ISLAMABAD (Agencies) In view of the devastation wreaked by the floods, Pakistan Defence Day would be observed with simplicity but with national spirit today. All functions and ceremonies with respect to this day have been cancelled. To this effect, the government has directed to the armed forces to postpone all ceremonies in connection with the Defence Day and all expenditures that were to be incurred for holding the ceremonies should be diverted to the flood affectees relief fund. On the occasion of Defence Day, tribute would be paid to the martyrs of 1965 war by putting flowers on their graves and prayers for them. All the cantonments have also postponed the festivities, which they organised every year on this occasion including the defence exhibition. Meanwhile Air Force Day on Sept 7 would also be observed with simplicity.