Special Judge Hemani Malhotra awarded the jail term to T Manikadan, a resident of Delhi Cantonment, while allowing the appeal of Delhi Police against his acquittal by a trial court.
"Considering the nature of offence, coupled with the fact that convict being in Indian Army was to protect and instead turned into a perpetrator, he does not deserve any leniency.
"It stands firmly established that respondent T Manikadam had outraged the modesty and sexually harassed the complainant," the court said.
According to the police, the incident took place on the night of February 22, 2013 when the woman was going towards New Delhi Railway Station after finishing her work at office.
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When she reached near Paharganj bridge, Manikadan, who seemed to be in drunken state, came from the front side and molested her, it said, adding that the woman raised an alarm and the man was caught by passersby and handed over to police.
The court, however, said his argument was contradictory.
It said the woman remained consistent regarding the incident and there was no reason to doubt about her testimony as she had no previous enmity with the man.
"Her testimony regarding the man being drunk at the time of the incident is supported by his MLC which mentions the fact that he was smelling of alcohol when he was medically examined on the date of the incident," the judge said.
Public prosecutor Atul Shrivastava had sought maximum punishment for the convict saying he did not deserve any leniency.