Bales' attorneys have said that their client's mental state may have possibly been clouded by the alcohol as well as steroids and sleeping aids he had taken, but prosecutors countered that comments made by Bales after he was apprehended demonstrated he had a clear state of mind about the violent acts he is alleged to have committed.
An Army press release said that Bales faces a maximum punishment of death if he is convicted of the charges against him. However, the release noted it may be difficult for prosecutors to obtain such a sentence.
"For capital punishment to be imposed, the court-martial members must unanimously find: the service member is guilty of the eligible crime; at least one aggravating factor exists; and that the aggravating factor must substantially outweigh any extenuating or mitigating circumstances found by the court-martial members," it says.
There has not been a military execution since 1961.