Dayton marked the first occasion when three-dimensional satellite image technology and digital cartography was used to determine and delineate boundaries in an official treaty.[2] Due to the speed and intensity of the negotiations (especially towards the end), a series of Inter-Entity Boundary Line commissions still needed to be held over the first 6 months of the NATO-led Implementation Force (IFOR) operation to iron out the remaining details of some of the boundaries (especially within Sarajevo). Over 40 changes to the IEBL were negotiated by the parties in meetings facilitated by the Chief of Staff HQ ARRC, Major General Michael Willcocks.