Defining technical terms or terms that the common reader may not fully understand or be familiar with is important to your argument.   It assures that the reader fully comprehends what the writer is trying to portray.    While these terms may be common or general knowledge to those who are or once was military,  I'm not sure that the general public fully understand these terms.   I know if I hadn't been in the military, I wouldn't have been able to fully grasp them.  
  
     I choose DADT,  unit morale,  readiness, cohesion and discharge.  While these are generally common knowledge, I believe it has a little bit different meaning to the military.    For example, yes every work place has morale and it needs to be high but at 5pm you punch out and thats that.  You go home to your own lives and leave work and your coworkers behind until the next morning. 
    
     Morale for the military is a little bit different,  its extremely important that this morale is high esspeically in deployed locations.  You don't get to punch out and forget about work til the next morning.  You don't get a break. When your deployed your living with the same people you work with everday.  In a sense for the military morale has a completely different meaning.