601 Lobos is a squadron of the Portuguese Air Force that operates an aircraft that is easily distinguished by its distinctive tail stinger or "MAD Boom", used for what?
Lockheed P-3 Orion: The Lockheed P-3 Orion is a four-engine turboprop anti-submarine and maritime surveillance aircraft developed for the United States Navy and introduced in the 1960s. Lockheed P-3 Orion:  The aircraft is easily distinguished from the Electra by its distinctive tail stinger or "MAD Boom", used for the magnetic detection of submarines.
i don't know