Knowing the way the police work, some PC has sat down with the Police National Legal Database or the Police Visual Handbook or whatever to try and find an offence that could be used here. Havign found one, they won't have realised that the offence is under the Army Act....does the Army Act apply to Civilians? If so then just think of all the military specific offences that could be applied to civilians.
I would wait to see if he is actually prosecuted and for what offence.