Two more NATO service members have been killed in weekend attacks in Afghanistan, the military coalition said Sunday.This has been the deadliest year of the nine-year Afghan war for international troops, and the rising death toll has added to calls in many NATO countries to start drawing down troops quickly. Monthly deaths peaked in June — when 103 NATO forces were killed.The latest deaths included one service member who died Sunday in a battle with insurgents in the north, and another who was killed by a bomb attack Saturday in the south.No other details were provided, in keeping with NATO's policy of waiting for national authorities to release information on their own casualties.