During the war, SC 64 served in the Second and Third Naval Districts. 

First photo: SC 64, SC 63, and SC 330. I suspect this is in Guantanamo, sometime around April of 1919. Thanks to Donna Rutterbush, whose great uncle, Harry Daniel Hockman, served in the USN in WWI, for submitting the photo to The Subchaser Archives.

Second photo: SC 64 post-war, at the U.S. Naval Training Station in Illinois.  T. Woofenden Collection.

Photo Set - click to view large versions
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Chasers possibly at Guantanamo in 1919
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SC 64 Post-war