BAESystems is the UK’s largest defence and security company, employing 39,000 people. It has four main operational divisions – maritime, regional aircraft, military air & information, and applied intelligence (cyber operations). To support these, the company has a fifth division – namely its Shared Service division as explained here.
This division is responsible for a number of functions – IT delivery and support, finance back office, human resources, indirect procurement, facilities management, and air shuttle services (i.e. transportation between sites). The advantage of this approach is that the company shares best practice, drives continuous improvement, and achieves economies of scale.