WW1 Draft exemption

I am trying to determine if my grandfather received an exemption from the WW1 draft and, if so, how/where this exemption was granted. Any information would be greatly appreciated. Here is grandpa's info:
DAVID OAKLEY CONWELL, a resident of Lewisburg, TN, born June 11, 1895 in Booneville, TN, registered for the draft June 5, 1917 in Marshall County, TN and claimed exemption because his Mother and brother under 12 years of age were solely dependent on him.
Conwell Edward Boccia, HMCS(ret), USN
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