Liberals pledged not to buy the planes, but spent $30M to stay in consortium developing them.
U.S. Gen. Herbert Carlisle said he is prepared to send it to Syria or any other war zone if needed.
The government quietly made the payment last month.
The federal government estimated earlier this year that 33 Canadian companies were working on the program.
Ryan Remiorz/The Canadian Press
The Pentagon's top acquisition official says the Canadian supply base is an essential part of the program and will remain as such, even if the nation does not buy the aircraft.
The Tory leader says Trudeau's plan would "crater" the aerospace industry.
The Liberal leader is defending his plan as questions swirl.
The Conservative and NDP leaders both said it showed a lack of judgment by the Liberal leader.
And the money saved by scrapping the procurement would go to increasing spending on the Royal Canadian Navy.
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