<Tr> <Td> Operation Freedom's Sentinel (OFS) </Td> <Td> 1 January 2015 </Td> <Td> Present </Td> </Tr> <P> The Coast Guard awards the medal for different operations (qv). </P> <P> To receive the Global War on Terrorism Service Medal, a military service member must have served on active duty during a designated anti-terrorism operation for a minimum 30 consecutive or 60 non-consecutive days . For those who were engaged in combat, killed, or wounded in the line of duty the time requirement is waived . </P> <P> The initial authorized operation for the Global War on Terrorism Service Medal was the so - called "Airport Security Operation" which occurred between 27 September 2001 and 31 May 2002 . Additional operations, for which the Global War on Terrorism Service Medal is authorized, include the active military campaigns of Operation Enduring Freedom, Operation Noble Eagle, and Operation Iraqi Freedom . Future operations are at the discretion of United States component commanders upon approval from the United States Department of Defense . </P>

Who is authorized to wear the global war on terrorism ribbon
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