Grandmom was devoted to the memory of her brother Taddle who was killed during World War I. Here is a photo of her locket with Taddle’s picture in it.
The back (MVC = Margaret Veronica Craven):
The image on the front is a service flag.
“The Service Flag is an official banner authorized by the Department of Defense for display by families who have members serving in the Armed Forces during any period of war or hostilities the United States may be engaged in for the duration of such hostilities.
“The history of the Service Flag is as patriotic and touching as the symbolism each star represents to the families that display them.
“The service flag (also known as ‘blue star banners’ or ‘son in service flags’) was designed and patented by World War I Army Captain Robert L. Queissner of the 5th Ohio Infantry who had two sons serving on the front line.”
If the soldier dies in battle, the blue star is replaced with a gold one. That means Grandmom must have gotten the locket while Taddle was still alive and serving in the Army.
“The color of the stars is also symbolic in that the blue star represents hope and pride and the gold star represents sacrifice to the cause of liberty and freedom.” (ibid)