What made the lapse glaring is the fact that the attack took place in Jammu, considered relatively safer than the Kashmir Valley where militants find safe passage and shelter among sympathisers to their cause.
Separately, in July a year ago, the government had delegated "substantial" financial powers to the Army, the Navy and the Indian Air Force to strengthen perimeter security at sensitive bases across the country.
A defence spokesperson in Jammu said the terrorists entered the camp after an exchange of fire with a sentry near the family quarters at the rear.
Earlier too Jaish militants had managed to strike at security forces despite advance warnings.
The camp is located on the outskirts of the city of Jammu.
Declaring its support for the government and the Army, the Congress urged the prime minister to personally supervise the anti-terror operation so that the security forces could give a befitting response to its sponsor Pakistan.
Two Junior Commissioned Officers (JFOs) have been killed and six others, including a colonel and a girl, wounded in the predawn terror attack and subsequent fighting. It was one of the deadliest militant attacks on a defence installation in India. "Now the attack has been contained and operation is still in progress".
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Police sources earlier said that the attackers split themselves into two groups and one of these was "isolated" in a corner of a four-storey building within the camp.
Army officials said a major, who was injured, was airlifted to an Udhampur hospital where his condition was stated to be critical.
Afzal Guru, convicted in the 13 December 2001 Parliament attack case, was hanged to death in Delhi's Tihar jail on 9 February 2013.
It is not clear how many terrorists carried out the attack but three of them, belonging to the Jaish-e-Mohammed, have been killed.
Similar papers were found on the bodies of intruders who were gunned down during an attack on a police post at Rajbagh police station in Kathua in Jammu on March 20, 2015 and the attack on an Army camp in nearby Samba on March 21, 2015. During the Pathankot attack, a note was left by the attackers that they belonged to the squad.
"Congress will not comment on the ongoing operation in Sunjuwan", Congress chief spokesperson Randeep Surjewala said.