As a clone with a mental defect, that of obsessive tendencies bordering on being a danger to others, he would have been terminated long before he had a chance to enter combat, but the fact that his obsessive tendencies drove him to work almost to exhaustion in favor of his squad and the GAR made the Council reconsider and instead put him to use where his mental defect would do the most good. But when things look grim and the line is failing... the younger clones retreat to leave this engineer to mop up the mess with merciless efficiency. In his own words: experience is everything.