Thanks to your construction crew, you can build or improve buildings on your base. The construction crew is present from the start of the game.
Military construction troops are only typical of major countries, and the largest and most significant were those of the United States Army. Upon landing in Normandy, the British and American military construction forces dealt ably with a complete lack of port facilities. They built thousands of kilometers of pipelines to transport the military's fuel. The greatest achievement of the engineering troops in the United States during World War II was the construction of the Alaskan motorway, which crosses the north-western part of Canada, for transporting manpower and military resources to the territory of Alaska.