Ocean Color Experiment Office of the Chief Economist Office of the Chief Engineer Officer Conducting the Exercise Outpatient Code Editor Office of Criminal Enforcement One-Center Expansion Open Collaboration Environment Optical Control Electronics Office of the Chief Executive Office of the Chief of Engineers On-Call Engineer Oregon, California and Eastern Railway Division of Ocean Sciences Heliocean observable cholinomimetic effects Ocean Color Experimetn Ocean Covered Earth Oceania Office chief of engineers Office of Civil Enforcement Office of Compliance and Enforcement Office of Congressional Ethics Office of Continuing Education Office of the Corps of Engineers Officer Conducting Exercise Olin College of Engineering Online Capacity Expansion Open Catalog Extension Open colaborative environment