Expense Credit: Arstotzka's Academy of Adequate Apprenticeship
The Academy has done a good job of training new apprentices in the mystical arts of mathemagics, but the limiting factor isn't the training - it's the enrollment. For a fine as the Academy is, it could house so many more burgeoning young mages than it currently does. Clearly, we need to find more apprentices.
The AAAA is proud to offer its very first military scholarship! By scouring the nearby villages and towns for youngsters with even the most remote hint of magical or mathematical talent and offering them a scholarship to attend the very prestigious Academy, we can almost double the amount of apprentices we can field. The only catch is that the individual must agree to serve two years in the Arstotzkan Military after their three-month education, but afterwards they're free to return to their villages and use their magic to improve the quality of life for their friends, neighbors, and family.
We get more sign-ups once we remove the mortality rate of apprentices from the flyer, but mathemagical talent is rare to find. Still, the halls of the AAAA are soon bustling with young men and women who will one day serve Arstotzka proudly on the front lines.
Glory to Arstotzka. Expensive
Note: you've about tapped all the magic users in your country. Newer ones are being born all the time and coming of age, but at the moment the only ones you don't have are the ones who've declined the offer.