F-5A - single-seat fighter version of F-5, originally without radar, but was equipped with AN/APQ-153 radar later.
F-5B - two-seat trainer version.
F-5E Tiger II - single-seat light fighter version with AN/APQ-159 replacing earlier AN/APQ-153 in F-5A.
F-5F Tiger II - two-seat combat-capable trainer.
RF-5E Tigereye - single-seat reconnaissance version of F-5E fighter. Exported to Saudi Arabia and Malaysia.
F-5N - Ex-Swiss Air Force F-5E used by U.S. Navy & Marine Corps as "adversary squadron" aircraft, with AN/APG-69 replacing the original AN/APQ-159, still in service in 2015.
F-5N/F - Ex-Swiss Air Force F-5F used by U.S. Navy & Marine Corps as "adversary squadron" aircraft, with AN/APG-69 replacing the original AN/APQ-159, still in service in 2015
The only U.S. units flying F-5N / F-5N/F are VFC-13 & VFC-111 (U.S. Navy) and VMFT-401 (U.S. Marine Corps)
Patrouille Suisse - an aerobatic team of the Swiss Air Force. (operates six F-5E Tiger II aircraft out of total of twelve F-5E that are maintained in team colors) [8 August 1964 – present]