A White House effort to create a new breed of interagency-savvy national security officials has been delayed until October, diminishing the chances that the initiative will produce noticeable results during President Bush's tenure, according to defense officials and experts. In an executive order unveiled last May, Bush promoted a common strategy for the professional development of government officials whose jobs touch on national security issues. The move was billed as an attempt to overcome shortfalls in interagency collaboration that became...