The 138th was reassigned to Air Service HQ .
The 138th was took over the courier and liaison duties of the 9th Aero until the entire Third Army Air Service Headquarters itself was demobilized on 2 July 1919 .
The 138th was reassigned to Air Service HQ and took over the courier and liaison duties of the 9th Aero until the entire Third Army Air Service Headquarters itself was demobilized on 2 July 1919 .