MARINE CORPS RECRUIT DEPOT PARRIS ISLAND, S.C. -- -- When the word "master" appears in the job title, you'd better be good."Drill is perfection," said GySgt. Troy Black, Regimental/Depot Drill Master. "There's no such thing as good enough. There's nothing in the drill manual that says good enough."Drill masters aboard the Depot are responsible for ensuring that drill is being taught correctly. Black supervises all the battalion drill masters as well as the Drill Instructor School drill master.In addition to conducting graduation practices, Black is also responsible for making sure other ceremonial events are conducted properly such as change-of-commands, posts and relief and the Marine Corps Ball. The Drill Instructor School drill master is responsible for teaching drill to the students there. Battalion drill masters oversee drill instruction in their respective battalions, which includes assisting drill instructors with teaching drill. Despite the apparent routine of the job, every day is different. "The nature of the job is repetitive," said Black, "but the intricacies are different. It's motivating [and] it's very prestigious." "I don't know that there is a typical day really," said SSgt. Deloree Lombardi, 4th Recruit Training Bn. Drill Master. "I spend most of my time preparing the graduating company for the graduation ceremony."The day doesn't stop if there's no graduation that week."When I don't have a graduation scheduled I observe as well as grade drill throughout the regiment and try to give pointers to the drill instructors for things to do with their platoons in order to help bring their scores up," said Lombardi.Every drill master grades their respective regiment for drill, and Black observes them all. Black also coordinates with the Drill Instructor School drill master to ensure that everyone in the Regiment is on the same page when teaching drill.Not everyone can become a drill master. There are a limited number of battalion and school drill masters. In Black's case, he is only one of two Regimental Drill Masters in the entire Marine Corps. The other is his counterpart at Marine Corps Recruit Depot, San Diego."It's a very skill-specific billet," said Black. "[It takes] someone who's been successful at drill [while training recruits.]"It's that success that's passed down to the other drill instructors. Black gives credit for the success the Depot has in drill to the battalion and school drill masters."They're the ones that do all the hard work," said Black. "[All] I basically do is coordinate."Graduation is the big day for everyone. It's when everybody, recruits, drill instructors and drill masters, all get to show off for their friends and family. Though Black takes charge of the graduating companies the last week of recruit training, the battalion drill masters have been working for weeks to make sure each step is correct and in unison on the last day.Six Marines bear the responsibility of ensuring that when the command "forward, march!" is given, the drill instructors, and thus, the recruits, are stepping off on the same foot. When the graduating companies step onto the Peatross Parade Deck their last day, its clear to everyone why their overseers were called "master."