Three Gulfstream V jets based at Andrews AFB flying for the US Army's Priority Air Transport (and designated C-37A for the G500 and C-37B for the G550) have unique serial numbers denoting dates of historical significance in the history of the Army.
The first aircraft, a C-37A, has the serial number 05-1944 to commemorate the D-Day landings on the Normandy coast during the Second World War.
The second aircraft is also a C-37A and has the serial number 02-1863 to commemorate the Battle of Gettysburg in the American Civil War.
The last aircraft is a C-37B and has the serial number 04-1778 to commemorate the passage of an act of Congress that created the Army.
Source: Air Forces Monthly, May 2008. "Distinguished Airlift" by Dave Willis, p80.