When very specialized skills are needed, people want assurance that they are going to stay in their position for a number of years.
Remuneration is another important consideration. Even though those who consider a career in the armed forces are not motivated by money, it's still important to offer them competitive pay vis‑à‑vis the private sector, which has the ability to pay people in the field very well. It's important to think about the system for compensating people with these special skills.