Can you get felony charges waived to join the army?
No, as a condition of joining the army one cannot get felony charges waived. if you presently have felony charges pending against you, there is a very good chance that if you are convicted of the crime that you are writing about that you will not be admitted into the United States Army.
There is also the possibility that depending upon the type of misdemeanor you might receive if there is a plea deal, the misdemeanor might prevent you from joining this country's army. I suggest that if you have not retained an attorney about the matter you are writing about that you do so sooner rather than later.