The full form of GREF is General Reserve Engineer Force.

The Border Roads Organisation (BRO)(Indian army corps of engineers) develops and maintains road networks in India’s border areas and friendly neighboring countries. BRO maintains operations in 19 states & three UTs (Andaman and Nicobar Islands, J&K and Laddakh), and neighboring countries such as Afghanistan, Bhutan, Myanmar, and Sri Lanka. The BRO operates and maintains over 32,885 kilometers of roads and about 12,200 meters of permanent bridges in the country.

The BRO operates in 18 Projects(17 Functional) namely: Arunank, Beacon, Brahmank, Chetak, Deepak, Dantak, Himank, Hirak, Pushpak, Sampark, Setuk(currently non-functional), Sewak, Shivalik, Swastik, Udayak, Vartak, Vijayak and sela tunnel. BRO is instrumental in significantly upgrading and building new India-China Border Roads.

Officers from the Border Roads Engineering Service (BRES) and personnel from the General Reserve Engineer Force (GREF) form the parent cadre of the Border Roads Organisation. It is also staffed by officers and troops drawn from the Indian Army’s Corps of Engineers on extra regimental employment (on Deputation).

The BRO consists of Border Roads Wing in the Ministry of Defence and the General Reserve Engineer Force (GREF). GREF—the execution force—under the Ministry of Defence, officers from Indian Army Corps of Engineers, who are posted to GREF on ERE. The status of GREF is equivalent to that of JAKLI in the Indian Army.

The Border Roads Organisation (BRO) develops and maintains road networks in India’s border areas and friendly neighbouring countries. It is staffed by officers and troops drawn from the Indian Army‘s Corps of Engineers, Electrical and Mechanical Engineers, Army Service Corps, Military Police and army personnel on extra regimental employment. Officers from the Border Roads Engineering Service and personnel from the General Reserve Engineer Force (GREF) form the parent cadre of the Border Roads Organisation. Currently, the organisation maintains operations in twenty-one states, one UT (Andaman and Nicobar Islands), and neighbouring countries such as Afghanistan, Bhutan, Myanmar, and Sri Lanka. The BRO operates and maintains over 32,885 kilometres of roads and about 12,200 meters of permanent bridges in the country. Presently, BRO is also involved in the construction of a tunnel at the Rohtang passwhich is estimated to be ready by 2019.