In the Austrian Armed Forces, a guard was killed by a superior after an exchange of fire on Friday morning.
According to the Ministry of Defense in Vienna, the soldier had previously fired several shots.
The supervisor was injured in the incident.
There was no reliable information about the reason for the argument.
According to media reports, the exchange of fire was preceded by a dispute between the young soldier and his superior.
Stephen Lowenstein
Political correspondent based in Vienna.
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The incident took place at 6:55 a.m. at the airfield barracks in Wiener Neustadt, a town in Lower Austria.
Soldiers from the Jagdkommando are stationed in the barracks, these are the Austrian special forces.
According to the Ministry of Defence, a 20-year-old conscript man threatened his comrades and attacked his superior during the changing of the guard.
This was the "officer of the day" on duty, an experienced 54-year-old non-commissioned officer.
"Several shots were fired in the course of the argument, after which the conscript was fatally hit," the Ministry of Defense said.
The non-commissioned officer survived the incident and was being treated in hospital.
It was initially unclear whether his injury resulted from a gunshot.
Those involved in the incident are being looked after by the Army Psychological Service, and an investigative commission has been set up.
The investigations are conducted by the civilian police.
The murder and crime scene group of the State Criminal Police Office is conducting forensics and interviews, as a police spokesman said.