The Rebel colonists submarineTurtle attempted to attach an underwater mine against the hull of the British Admirals flagship Eagle. That refers us back to a February 7th Q drop in which Iron Eagle was mentioned in drop #679.
Specifically, the reference was to this:
You have so much more than you know.
SO MUCH!
Future proves past.
News unlocks map.
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RED OCTOBER (a found "missing" submarine, as Q takes pains to later point out by mentioning that hes dropped "The Hunt for" Swordmaker)
IRON EAGLE
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Q
The very next message #680, posted a couple minutes later, is in response to the direct question of "military target square?" Referencing the [] in Qs last post. Qs response:
Kill box.
Q