President Clinton is enjoying unconditional backing on the Bosnia mission from British Prime Minister John Major. "We need to make sure that [the prospect of peace] doesn't in some fashion just slip away from us," said Major, who welcomed Clinton to 10 Downing Street today. "It's vital to deploy a genuinely effective implementation force to Bosnia as soon as the peace agreements come into effect." Major said Britain would contribute 13,000 troops to the NATO peacekeeping operation. In an address this afternoon, Clinton told to Parliament that the United States would "make the difference between peace and war in Bosnia."