The project is a big one. China plans to grow 6.66 million hectares of new forest this year, having already created 33.8 million hectares (338,000 square kilometres) of forest in the past five years, says Zhang Jianlong, head of the State Forestry Administration, in a report from Reuters. The country wants to increase the area of land covered by woodlands from 21.7% in 2016 to 23% by 2020, according toChina Daily.

The majority of the reassigned soldiers will work in the heavily polluted Hebei Province, where three new state forests are planned. The province is often blamed for producing the fumes and smog that cover Beijing and northern China, and has committed to increasing its forest coverage to 35% by the end of 2020.

The re-assignment won’t come as a total surprise: several staff have been switched to non-military missions since plans to cut 300,000 troops were announced in 2015. According to Asia Times, the redeployed troops are not unhappy: planting trees inland gets them away from the tough living conditions on China’s northern borders.