Lt Gen Chachra assumed the charge of GOC-in-C of the prestigious Northern (Dhruva) Command at a simple ceremony in Udhampur, a Defence spokesman said.
He succeeded Lt Gen K T Parnaik who retired yesterday after 41 years of service.
A second generation Rajput Officer, Lt Gen Chachra was commissioned to 17 Rajput in June 1974, he said.
An alumnus of National Defence Academy, Khadakvasla, and Indian Military Academy, Dehradun, Lt Gen Chachra has varied combat, staff and instructional experience.
The officer has been on active combat service in Siachen glacier, high altitude border areas of North and North-East and commanded 16 Rajput in a counter-insurgency environment.
Lt Gen Chachra was GOC-in-C, Western Command, prior to assuming charge of the Northern Command.
As Director, Foreign Training and International Cooperation, the officer successfully initiated and executed military synergy with a number of friendly foreign armies, the spokesman said.