Following his entrance into the armed forces of the Covenant, Bero 'Wattinree took part in combating the rebellious Unggoy in 2462, rising to the rank of Major for his fighting abilities and offensive spirit. In the years that followed, Bero attained the rank of Officer, leading various ground and space forces during the 23rd Age of Doubt. As a commander, he led ground forces against the Unggoy twice more, taking part in both the Eighth and Thirteenth Unggoy Disobediences: upon the conclusion of the latter, 'Wattinree was promoted to the rank of Ultra and fast-tracked to Fleet Master. After two standard tours of duty, Bero 'Wattinree was recalled to High Charity and promoted to General in 2504. He subsequently conducted several additional tours as Fleet Master of the fleets Resplendent Pie