The best way to let Obama know that John Kerry is unacceptable as a candidate of SecDef, is the simple message that “The Pentagon will be unable to insure the safety of senator Kerry”.
When Clinton was POTUS, the Pentagon advised him that at least a dozen major installations and ships could not guarantee his safety were he to visit them. He took the hint.
But Kerry is much, much worse. He is regarded as a traitor to the United States and his comrades in arms, a person who gave aid and comfort to the enemy, while falsely accusing honorable military personnel of being war criminals, in sworn testimony before congress.
In effect, he is the last unrepentant enemy soldier of the Vietnam War, and no enlisted person or officer sworn to protect and defend the constitution of the United States will be able to abide their oath and work for him.
“The Pentagon will be unable to insure the safety of senator Kerry”.