Captain Mike Green, an Army veteran, died when his helicopter collided in mid-air with a small airplane near the Waddesdon Estate, the former country seat of the Rothschild banking dynasty.

On November 15th, 2 days before his death, Q dropped a stringer (a military command) that relayed info about Green's operation (see drops 155, 102).  The operation was intercepted by bad guys (rogue operator), who ordered a small plane (Cessna) to take out Green's helicopter (see drop 179).  It sounds like Green was going to deliver something important to the Rothchilds, but we don't know exactly what.  Q confirm's an anon's theory on Green's mission in drop 183.

Captain Mike Green is a hero who made the ultimate sacrifice for our country.