Military

Generally, issuance of an MPO does not result in someone being discharged from the military. We have more information on MPOs on our website here if you want to read about them: http://www.womenslaw.org//laws_state_type.php?id=10866&state_code=US&lan…
However, in order to find out if this could ever be a possibility, I reached out to a military/domestic violence expert from the National Center on Domestic and Sexual Violence and here is what she told me:

Just entering a protective order would not result in an action to separate the servicemember in and of itself.  However, it could be that as part of the Family Advocacy recommendations the use of violence and/or the weapon has been so egregious that they also recommend to Command to consider the separation (discharge from the military).  

The person who I reached out to, who has been doing this work for many years, said that she  only heard of that a few times when this happened in all of her years of work.  And it happened when the JAG or SJA (the military attorneys) felt so disturbed by the conduct s/he felt Command should consider the involuntary removal.  If for example, the service member is accused of something like attempted murder then yes, the decision might be made to cut him/her loose ASAP and it would likely be a court martial.  However, most of the time, the person is allowed to continue serving.  If the allegations involve something like sexual abuse of children, it could be possible that the service member would be allowed to serve until his/her next normal time to re-up (re-enlist) and then the military could decline the request or does not extend an offer to continue.  So, for example, if the servicemember signed up for a 6-year commitment and in year 5, s/he commits an offense he may well be permitted to only serve one more year.