They were Colombian mercenaries, Haitian authorities said, dispatched in a brazen international plot orchestrated through a Florida-based security firm that culminated in the assassination of President Jovenel Moïse and plunged the nation into uncertainty and terror. Eighteen Colombians, most of them former soldiers, some hailing from elite units, have been arrested in connection with the July 7 assassination. Three others were killed in the aftermath of the assault, while five more are reportedly still at large. Two Haitian Americans, one a former U.S. government informant, turned themselves in hours after the attack, claiming that they were translators aiding an effort to serve an arrest warrant on the president and transfer him to the presidential palace, not to kill him. At least seven of the alleged assassins received U.S. training during their military careers. According to a U.S. official, between 2001 and 2015, the soldiers received instruction in both Colombia and the U.S. on skills ranging from military leadership and professional development to counternarcotics and counterterrorism. The Colombians' presence in Haiti has opened a rare window into a murky private security world that extends from the U.S. into Latin America and the Caribbean. Through three of the most consequential conflicts of the past century " the Cold War, the drug war, and the war on terror " the interlocking relationship between U.S. and Colombian security forces has produced a generation of hired guns.