That is a career ender there.Last week a Belgian Air Force F-16 was destroyed yuh its 20mm cannon into it. None of the articles say whether they were training rounds or not but the plane that was hit was fully fueled so it probably wouldn't have mattered what it got hit with. Two personnel were treated for hearing injuries.
I'm not sure how this could have happened. On the planes I work on certain functions are inhibited on the ground (like landing gear retraction). It can be bypassed during maintenance but it sounds like these guys were getting ready to fly.