The man named as the shooter in Monday’s Washington Navy Yard rampage had a highly checkered four-year career as a Navy reservist, a period marked by repeated run-ins with the law and his military superiors, Navy officials said Tuesday.

Aaron Alexis was cited at least eight times for misconduct for offenses as minor as a traffic ticket and showing up late for work but also as serious as insubordination and disorderly conduct, according to a Navy official who spoke on condition of anonymity to discuss the gunman’s personnel record.