What does Deputy Defense Secretary Paul Wolfowitz mean?

A senior Pentagon official is disputing published suggestions that the Bush Administration may be poised to resume underground nuclear testing beneath the Nevada desert. Deputy Defense Secretary Paul Wolfowitz says the administration has no plans to order a resumption of nuclear testing: "I’m not aware of a need to resume testing at this time."
     But Mr. Wolfowitz said in an interview with radio reporters that he cannot rule out the possibility that testing--suspended nine years ago may one day again be necessary.
     There may be circumstances, where--particularly if we develop questions about the reliability or safety of, our nuclear weapons- where you would have to contemplate doing that [testing]. And, bear in mind, these are things that age with time, and more so because the elements of which they are composed axe radioactive and are actively decomposing all the time. So, you have to keep a very close eye on the condition of that force. But, I am not aware of any imminent need to contemplate testing.