I think the C-17 was a remarkable success and continues to be. All the C-17 users in the world keep a common configuration of the aircraft, so that if you got into a U.S. one it would look like an Australian or Canadian one. That's by design, because it gives us flexibility and redundancy.
I'll give you one story that I think is emblematic of what this capacity provides.
When Typhoon Haiyan hit in the Philippines, all of our C-17s were between Afghanistan and Canada, because we were bringing all of our equipment back. Within 24 hours they were outbound the other way. In fact, with the exception of the U.S., which had troops in Guam and Japan, Canada was the first country there. It was the C-17 that allowed that Canadian expression of support to the Philippines to be there quickly and on time.