Gregor McGill, a senior lawyer at the Crown Prosecution Service, said: "On Friday, 5 December 2014, the CPS received a file concerning an allegation against one individual, formerly a private in the Army, of misconduct in public office.
"The evidence in this case was considered very carefully and although there was sufficient evidence to prosecute this offence, when considering the public interest it was decided that a conditional caution was an appropriate course of action.
"The individual was yesterday [Monday, 22 December] conditionally cautioned for an allegation that she entered into an agreement to obtain information from within Army barracks for a newspaper, the condition being that she must make a payment of £40 to a charity connected with the armed services. In accepting a conditional caution, an individual accepts responsibility for the offending set out.
"The evidence was considered carefully in accordance with the Code for Crown Prosecutors, the DPP's guidelines on the public interest in cases affecting the media and the DPP’s Guidance on Adult Conditional Cautions."