A Royal Military Police reservist from Essex has been jailed for 17 years for raping a girl of 12 who he groomed through BlackBerry Messenger (BBM).
Adrian Rose, 36, of Rochester Drive in Westcliff-on-Sea, had been found guilty of eight rapes, five counts of child abduction and one of grooming a girl.
Judge Stephen Holt, sentencing at Norwich Crown Court, said the grooming and rapes were "highly planned".
He said BBM, where messages are quickly deleted, was useful for paedophiles.
Rose, who was based in Aldershot, was also banned for life from using social networks unless he informed police and gave them his password for the site.
'Shattered young girl'
Rose was found in February 2012 in his car at the Broadland Business Park in Norwich with a 12-year-old girl who said she had sex with him.
Police were checking Rose's car because of concerns about the number plates and appearance. They found the girl, who was there without her parents' knowledge.
When Rose lied about her age, officers decided to take her home.
The girl, who cannot be named for legal reasons, said she had met Rose through BBM and they had sex.
Rose was later arrested in Southend and brought to trial accused of being a serial sex attacker.
Investigating officer Det Con Steve Graves, said: "The victim in this case is a very shattered young girl, but she is determined to get on with her life.
'Patrolled chat rooms'
"Rose is a predator who has denied his actions throughout, which meant the girl had to relive the traumatic events which have happened to her in order to bring him to justice.
"She and her family have received support from police and will continue to do so, and I commend her bravery in giving evidence."
Judge Holt told Rose: "You patrolled chat rooms looking for underage children and found a child of 12. You quickly gained her confidence using the BBM system which is particularly useful for a paedophile as messages once used cannot be retrieved."
He said the victim who had moved from Essex to Norfolk just before she came into contact with Rose was "very vulnerable".
Judge Holt said the planning included the use of social networks, having children's DVDs in his car, which had blacked out windows, and booking a family room at a Travelodge where one of the offences took place.