Glenn McLean, 37, drove two under-aged co-accused to Horsham Aerodrome on May 10, before gaining access with a screwdriver.

McLean stole $150, which he used to fill his car with petrol at an unknown service station, as well as computer equipment, which he later left at an unknown address.

Police prosecutor Sergeant Adam McCormack told court McLean's co-accused, two girls aged 15 and 17 who had befriended him, allegedly stole alcohol worth $50.

McLean's solicitor Nick Lucas said his client was separated from his wife, had been unable to see his 10-year-old child and was suffering from depression.

Mr Lucas said it was McLean's first offence and he had previously completed a Bachelor of Arts with Honours and was also a youth worker.

McLean was also a member of the Australia Army Reserves until 2008.

Mr Lucas called for no conviction with an undertaking of good behaviour.

Magistrate Richard Pithouse said the situation with the teenage girls was 'totally inappropriate'.

"It's a short path to jail," Mr Pithouse said.

"Mr McLean, the circumstances of the case are not unusual, but what is of concern is a 37-year-old man deciding to embark on a criminal career while in the company of juveniles.

"You will be able to call on your good references in this case and hopefully will not need to use them again.

"Don't breach the law, don't come back please."

Mr Pithouse placed McLean on a 12-month good behaviour bond, fined him $500 and ordered him to pay restitution costs of $200.