In 1972,Doctors without Borders conducted its fist major relief effort,helping victims of an earthquake in Nicaragua.Other significant missions were undertaken to care for vitims of fighting in Lebanon1976,Afhanistan1979,and the Russian requblic of Chechnya1995.Since the 1980s,Doctors without Borders has worked to relieve famine,offered medical care to casualties of war,and dealt with the problem of refugees in such African countries as Somalia,Ethiopia,the Sudan,Sierra Leone,and Rwanda