After the end of the war, the presence of Royal Marines as part of the Islands' defence led to the FIDF adopting RM dress and drill styles. On 28 September 1966, 19 members of an Argentine extremist group staged a symbolic invasion of the Islands by landing a DC-4 on Stanley Racecourse, in one of the first significant hijacking incidents; the extremist group called this action Operation Condor. There, they took four islanders hostage. The FIDF, alongside the Royal Marines, contained the situation and the group surrendered without casualties. Following this, the FIDF was on heightened alert until February 1967.