Lockheed Martin Corp. wants to make the F-35 stealth fighter jet even deadlier than it is today and has designs on how to do it. But many proposed changes are classified, so it’s hard to know what they are.

The F-35 fighter is manufactured and sold as the most advanced tactical aircraft. Its low-observable (“stealth”) qualities result in a radar signature comparable to that of a steel golf ball, and its sensor fusion gives the pilot unprecedented awareness.

The F-35 is so versatile that it can conduct missions ranging from air-to-air battles to precision bombings to radar jamming to intelligence gathering, and 16 nations have already purchased it—and more will follow.

The F-35 must maintain its fighting edge over potential adversaries through 2070, no matter how imaginative its original configuration was, according to Loren Thompson, Chief Operating Officer of the non-profit Lexington Institute and Chief Executive Officer of Source Associates.