The Grand Army of the Republic (GAR) was a fraternal organization composed of veterans who served in the Union Army, Navy, Marines, and Revenue Cutter Service during the American Civil War. The organization, which was founded in 1866, had several leaders known as Commanders-in-Chief over the years.
Some of the notable Commanders-in-Chief include:
These leaders played significant roles in shaping the organization, which was dissolved in 1956 when its last member passed away.
For more details, you can refer to Wikipedia's list of Grand Army of the Republic commanders-in-chief.
Here is an image related to the Grand Army of the Republic:
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