Item 2. PROPERTIES.

Our principal executive offices are located at owned facilities in Melbourne, Florida. As of January 1, 2021, we operated approximately 340 locations in the U.S., Europe, Canada, Australia, Asia, the Middle East and South America, consisting of approximately 26 million square feet of manufacturing, administrative, R&D, warehousing, engineering and office space, of which we owned approximately 11 million square feet and leased approximately 15 million square feet. There are no material encumbrances on any of our owned facilities. As of January 1, 2021, we had major operations at the following locations:

Integrated Mission Systems — Greenville, Rockwall and Waco, Texas; Burlington and Mirabel, Canada; Camden, New Jersey; Mason, Ohio; Sylmar, California; Tulsa, Oklahoma; Pittsburgh and Philadelphia, Pennsylvania; and Salt Lake City, Utah.

Space and Airborne Systems — Palm Bay, Malabar and Melbourne, Florida; Rochester and Amityville, New York; Clifton, New Jersey; Colorado Springs, Colorado; Van Nuys and San Diego, California; Fort Wayne, Indiana; Wilmington, Massachusetts; and Alpharetta, Georgia.

Communication Systems — Salt Lake City, Utah; Rochester, New York; Londonderry, New Hampshire; Lynchburg, Virginia; Tempe, Arizona; Farnborough, United Kingdom; Melbourne, Florida; and Brisbane, Australia.

Aviation Systems — Melbourne, Florida; Muskegon and Grand Rapids, Michigan; Torrance, Menlo Park and Anaheim, California; Arlington and Plano, Texas; Cincinnati, Ohio; Hauppauge, New York; Herndon, Virginia; Crawley, United Kingdom; and Phoenix, Arizona.

Corporate — Melbourne, Florida; and Washington, D.C.

The following is a summary of the approximate floor space of our offices and facilities in productive use, by segment, at January 1, 2021:

In our opinion, our facilities, whether owned or leased, are suitable and adequate for their intended purposes and have capacities adequate for current and projected needs. We frequently review our anticipated requirements for facilities and will, from time to time, acquire additional facilities, expand existing facilities and dispose of existing facilities or parts thereof, as management deems necessary. For more information about our lease obligations, see Note 19: Lease Commitments in the Notes. Our facilities and other properties are generally maintained in good operating condition.