That gets into the highly technical issues. The point you're making we can take specifically from the Libyan experience, where, by and large, before the NATO forces moved in, the U.S., from what's in the public domain, apparently had done most of the initial work to degrade enemy air defence systems. The United States have certain capabilities which none of the other allies have, not just in terms of stealth platforms, but in supporting technologies and systems, which have enabled them in repeated conflicts to take out and destroy relatively advanced—not that the Libyan one was—air defence systems.
On March 1st, 2012. See this statement in context.