If you can choose a job, the naval ground crew has the highest chance of changing to a non-commissioned officer, and it is not very tired. Air force ground service is second. The army is the most tired, and the armed police and firefighting are similar. But this is general, not absolute. Because the details still depend on the unit and major of your recruits: tired, technical, physical, and various. Even if the same recruit comes out, there will often be a big gap, which is decisive.