Constables instead of army men?

While addressing the staff of the Seminary this evening, the Bishop of Warangal, Bp Udumala Bala, narrated an experience of his sometime ago.  He said that he had just finished speaking about Seminary life and formation to a mixed group of Priests, religious and laity using the analogy of a nation investing and preparing its military/army who take on any and every enemy with courage and determination on behalf of the general population.  Someone in the assembly got up and continued, "The Church invests its best men and most amount of money in the formation of its Priests. Why then instead of army men, do we have constables?"

The question therefore, why do we have constables instead of army men? In religious terms, why do we have mere men in cassocks and celebrants of Mass instead of Men of God and People?