Shield
Azure, three bendlets wavy Argent, overall a four bastioned fort of the outline of old Fort Stanwix Or fimbriated Sable.
Crest
That for the regiments and separate battalions of the Army Reserve: From a wreath Argent and Azure, the Lexington Minute Man Proper. The statue of the Minute Man, Captain John Parker (H.H. Kitson, sculptor), stands on the common in Lexington, Massachusetts.
Motto
KA-YEN-SA-HAH (Keep The Flag Flying).
Shield
The 390th Infantry was organized after World War I and allocated to Central New York. The coat of arms is devised on the military traditions of the home territory. The most important military event in the history of the area was the defense of Fort Stanwix, built in 1758, on the site of the present city of Rome, New York. In August 1777, the fort was under the command of Colonel Peter Gansevoort. Word was brought of the newly adopted stars and stripes flag - one was made in the fort and displayed on 3 August 1777, and flew defiantly throughout the siege of St. Leger. This was the first time the Stars and Stripes flag came under fire and the fort is known as the fort which "Never surrendered." The regimental area is crossed by three main rivers - the Susquehanna, Black and Mohawk, all of historic significance. This fort was of distinctive design (bastion) and records of the original survey are available. The shield is the Infantry blue crossed by the three white rivers and over all the old fort in gold and black. The motto "Ka-yen-sa-hah" is an Iroquois Indian word meaning "flag up," or more freely translated "keep the flag flying." The close and free translations are appropriate as applying to the first place the flag went up and as the place where it did not come down.
Crest
The crest is that of the U.S. Army Reserve.
The coat of arms was originally approved for the 390th Regiment Infantry, Organized Reserves on 23 August 1924. It was redesignated for the 390th Regiment, Army Reserve on 26 January 1962.