If you can't read the text, here it is:
The "hairball" you see is hair - human hair. This happened March 27th at Holloman to an Army Civil Service Aircraft Maintenance Technician. He was literally "scalped" when his long hair caught on the rotating shaft. You all know my concern and position on this issue. I leave the choice up to you. Those who do have long hair should personally evaluate hair control requirements, the work situation, and their own personal safety concerns. Again - the choice is yours! It would be a tragedy to have it happen here. - Sully
Found at an old favorite, The Oops List (a fantastic resource of all things crash-related)
OTOH, they don't say the guy should have had short hair. Instead they talk about "hair control requirements". As a long haired guy myself I take restraining my hair around moving machinery very seriously. Better to tie hair back, braid it, or even wear a bun than to get it caught in rotating machinery. Better to look girly than get scalped!
I didn't believe it because I don't see blood all over. "Scalping" sounds like an exaggeration.