claim: John S. McCain Jr. entered the submarine service.
evidence: Isis River may refer to  :. Isis River -LRB- New South Wales -RRB- , a tributary of Pages River , Australia. Isis River -LRB- Queensland -RRB- , a tributary of Gregory River , Australia. Isis River -LRB- Tasmania -RRB- , a tributary of Macquarie River , Tasmania , Australia