Expansion at CFB Trenton will top $500 million.

Defence Minister Peter Mackay announced today the rebuilding of the flight line to accomodate evolving tactical and strategic airlift capabilities.

The projects are needed in part to accomodate the relocation of Joint Task Force 2 -- the elite commando unit -- from the national capital region to Trenton.

The projects will be in planning stage for the next five years.