they can but usally not
The nearest major airport is Zweibrücken Airport (ZQW / EDRZ). This airport has international and domestic flights from Zweibrucken, Germany and is about 34 driving miles from Ramstein AFB. Another major airport is Saarbrücken Airport (SCN / EDDR), which has international and domestic flights from Saarbrucken, Germany and is 35 road miles from the base.
The nearest major airport is Colorado Springs Airport(COS / KCOS). This airport has domestic flights and is about 9 road miles from Peterson AFB.The closest international airport is Denver International Airport - Denver, CO (DEN / KDEN), which is 87 driving miles distance from Peterson AFB.
The closest air force base to Jacksonville, Florida is the Jacksonville Air National Guard Base, also known as the Jacksonville International Airport Air National Guard Base. It is located at the Jacksonville International Airport.
Ramstein AFB
09009 I think
132 miles
Adjacent to the Charleston International Airport (CHS) in North Charleston, SC
yes
it takes 3 days
The air distance from Charleston AFB International Airport (CHS) in South Carolina to Bagram AFB Airport in Afghanistan is 7,365 miles. That equals 11,853 kilometers or 6,400 nautical miles.
There isn't one single address for the whole of the AFB - each unit and establishment will have it's own address. You need to specify which unit/establishment in the AFB you're trying to send mail to.