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I searched online and found a single undated photograph with the caption Indian troops deployed during the crisis in Vietnam, Cambodia and Laos.
I would suggest that you contact the National Archives of India and UN Archives and Records Management. You might also find photographs from journalists in back issues of newspapers. If the U.S. National Archives has any photographs, they are are most likely in the custody of National Archives at College Park - Still Pictures (RDSS) which can be contact via email at email@example.com.