This image is of cracks found during routine inspections of the Kaman Aerospace SH-2 Seasprite helicopter. Pilots and crew of these helicopters were seriously alarmed (and rightly so) when this information was released.

They were especially concerned because the cracks weren't found in just one location - they were all over the craft. There was no real uniformity to it. Click on the hyperlink to view:

Cracks on military aircraft.

(Hat tip to Steve)