Ottawa's primary employers are the Public Service of Canada and the high-tech industry, although tourism and healthcare also represent increasingly sizeable economic activities. The Federal government is the city's largest employer, employing over 110,000 individuals from the National Capital region. The national headquarters for many federal departments are in Ottawa, particularly throughout Centretown and in the Terrasses de la Chaudière and Place du Portage complexes in Hull. The National Defence Headquarters in Ottawa is the main command centre for the Canadian Armed Forces and hosts the Department of National Defence. The Ottawa area includes CFS Leitrim and the former CFB Rockcliffe. During the summer, the city hosts the Ceremonial Guard, which performs functions such as the Changing the Guard. As the national capital of Canada, tourism is an important part of Ottawa's economy, particularly after the 150th anniversary of Canada which was centred in Ottawa. The lead-up to the festivities saw much investment in civic infrastructure, upgrades to tourist infrastructure and increases in national cultural attractions. The National Capital Region annually attracts an estimated 7.3 million tourists, who spend about 1.18 billion dollars.