Would the military be more efficiant if they were unionized? I hear about the extremely long work hours in the army. I understand it hardens them for readiness for combat situations. With the technology and increase of intelligence need to operate it would a more normal work schedule be more efficient and less mistakes? 

How much more would it cost the military to have union like rules?
European countries offer a variety of different unionisation models, so provide reasonable evidence on the usual consequences of unionisation.  Dutch military personnel are represented by a union, for instance.

The European Association of Military Organisations appears sanguine about the idea, although many European military unions don't have the right to strike (emphasis added):


  The President concluded by emphasizing that EUROMIL strongly believes
  that military trade unionism does not harm military efficiency. On the
  contrary, being represented in trade unions and professional
  associations can enhance the [morale] and loyalty of the troops.


Less information is available about the consequences of unionisation on working hours; in general, it seems that unions appear to understand and accept the reasons for long working hours under certain circumstances.