Neither was it limited to silly messages, he also deleted files and accounts:
http://arstechnica.com/tech-policy/2...cide-concerns/deleted critical operating system files from nine computers and this led to a 24 hour shutdown of 2000 computers in the Washington network of the US Military,;
- deleted 2,455 user accounts on one particular US Army computer;
- deleted system files and logs from computers at the US Naval Weapons Station responsible for the identity, location, physical condition, staffing and battle readiness of US Navy ships, rendering the station's entire network of over 300 computers inoperable
Given the (OTT) message he left "I am SOLO. I will continue to disrupt at the highest levels", it gives lie to the "autistic kid just looking for ufo stuff"