First Things First:

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Two white marble military headstones in a national cemetery, one inscribed "3255 D.E. Leach" on grass, the other reading "John J. Hoff, Captain, U.S. Army" amid rows of similar markers under bare trees.
The name of the person is not written out completely on the headstone, making it difficult to know who was buried here.
This headstone does not have a rank engraved on it, whereas the typical headstone included rank.
This headstone does not indicate the unit to which the deceased belonged.
Think about it:

What type of people might be buried in these two graves?