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?
601 Squadron (Portugal): 601 Squadron ""Lobos"" ("Esquadra 601") is a maritime patrol and anti-submarine warfare squadron of the Portuguese Air Force (PoAF), currently based at Beja Air Base. 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