The USAF has acknowledged that about
25% of Global Hawks have crashed. Makes you wonder if there are more.
According to what I found on the web, including R&D, each GH cost
$218 million! The GAO found it had an accident rate
100 times the F-16 in a combat-zone.
(Northrop said it was unfair to compare a mature system with a new one).
Preds and Reapers have similar loss rates (70 lost), but are much cheaper ($10 million), so the USAF can justify it.