ONE U.N. peacekeeper from South Africa was killed in the eastern Democratic Republic of Congo when a helicopter operated by the peacekeeping force came under fire while in mid-air, the U.N. mission in Congo and South Africa's military said. The helicopter came under fire after taking off from the city of Beni in the early afternoon. Another South African peacekeeper was also wounded in the attack but could continue flying and landed safely at the airport of the provincial capital Goma, the South African National Defence Force said in a statement. Neither South Africa nor the U.N. mission called MONUSCO…