Long-distance relationships can be extremely difficult to handle.
Having to maintain a healthy relationship with minimal contact is no easy task. Military couples have it extra hard since they can spend months on end without seeing each other.
This is further compounded by the fact that military service is a dangerous line of work and it can leave the other person on constant edge, not knowing whether or not their loved one made it through the day.
Relationships like these are the most difficult to maintain.