(FILES) This file photo taken on June 29, 2015 shows an Airbus H225M helicopter (former Eurocopter EC725 Caracal) at the 5th RHC (Combat Helicopter Regiment) in Pau. The Polish Prosecutor's Office in Warsaw announced on October 28, 2016, the opening of an investigation into the about 3 billion euros tender for the military Airbus Helicopters, recently broken by Poland in the negotiation stage. / AFP PHOTO / IROZ GAIZKA