A JN-4D “Jenny” aircraft sits in the Enlisted Heritage and Training Complex at Joint Base San Antonio, Texas, Oct. 19, 2018. The Jenny performed admirably as a trainer for the U.S. Air Service during World War I, but its more significant role in aviation history was as a barnstorming and mail-carrying airplane in the 1920s. The EHTC began when the Airman Heritage Museum and the Security Forces Museum were combined into a single entity in 2014. These two facilities, along with the airpark and the museum warehouse, make up the training complex, which houses some one-of-a-kind artifacts. (U.S. Air Force photo by Sarayuth Pinthong)