He said that the commitment of his force has increased manyfold in scope and intensity in past few years.
"(Because of) the frequency of ceasefire violation and infiltration bids by our western neighbour, the border remains live and active," he said adding that "new methods" continue to be employed to create unrest in J&K.
"Recent incidents of terrorist violence are clear pointers...To extend this arc of violence to other areas," he said.
"This calls for maintaining very high levels of operational preparedness at all times, something that has now become inherent in our operational strategy," he said.
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Defence Minister Manohar Parrikar, who also spoke on the event, said the security situation is more complex and nuanced than earlier and called for round-the-clock vigilance.
"The security environment today is complex, nuanced compared to earlier. Therefore, we need to be vigilant taking into account all dimension so that all emerging challenges are suitably addressed," Parrikar said.
The Minister also said that school textbooks should include stories of valour from the war so that today's generation gets to know about the sacrifices rendered by the soldiers.
Both he and the Army Chief said that the 1965 war had dealt a heavy blow to Pakistan.
Parrikar praised the leadership of then Prime Minister Lal Bahadur Shastri.
On his part, Gen Singh said the war displayed "bold leadership" at all levels.