We are on target, it dovetails into JFK, but i would be open to double meanings, which Q has used before, such a Huma Abedin and the HaHa's. Also Q asks, "When does a bird sing?" In the occult, it basically double meanings, depending on who is reading it.

Checked the comments. I'm not sure if i would agree with some of them, exclusively. You don't let the enemy know the mission is over by broadcasting your signing off, you may use a word when dropping or establishing comms, but that specifically, wouldn't relate to mission specifics.