In October 1974, the Brazilian Air Force (FAB) ordered 36 F-5E and 6 F-5B aircraft from Northrop for $72 million.
The first three aircraft arrived on 12 March 1975.
In 1988, FAB acquired 22 F-5E and four F-5F second-hand USAF "aggressor" fighters.
A total of 15 of these aircraft were part of the initial batch of 30 aircraft produced by Northrop.
In 1990, FAB retired all remaining five F-5Bs; later, they were sent to Brazilian museums around the country.

In 2001, Elbit Systems and Embraer started work on a $230 million Brazilian F-5 modernization program, performed over an eight-year period, upgrading 46 F-5E/F aircraft, re-designated as F-5EM and F-5FM.
The modernization centered on several areas: new electronic warfare systems, the Grifo F radar, an air-to-air refueling system, INS/GPS-based navigation, support for new weapons, targeting and self-defense systems, HOTAS, LCD displays, helmet-mounted displays (HMDs), Radar Warning Receiver, encrypted communications, cockpit compatibility for night vision goggles, On-Board Oxygen Generation System (OBOGS) and various new onboard computer upgrades.
One important capability is the secure communication with R-99 airborne early warning platforms and ground stations.

Externally, the new aircraft features a larger nose cone that accommodates the larger radar equipment.
The first F-5EM was handed over on 21 September 2005.
On 7 July 2003, four Rafael Litening III targeting pods were ordered at a cost of US$13 million, to be used on F-5M together with three Rafael Sky Shield jamming pods ordered on 5 July 2006 at a cost of US$42 million.

In 2009, FAB bought eight single-seat and three twin-seat F-5F used aircraft from Jordan in a US$21 million deal.
These aircraft were built between 1975 and 1980.
On 14 April 2011, a contract of $153 million was signed with Embraer and Elbit to modernize the additional F-5s bought from Jordan, and to supply one more flight simulator as a continuation of the contract signed in 2000.
These F-5s will receive the same configuration as those from the initial 46 F-5s currently completing the upgrade process.
The first delivery of this second batch of upgraded jet fighters is scheduled for 2013 with expected use to 2030.
In October 1974, the Brazilian Air Force (FAB) ordered 36 F-5E and 6 F-5B aircraft from Northrop for $72 million. The first three aircraft arrived on 12 March 1975. In 1988, FAB acquired 22 F-5E and four F-5F second-hand USAF "aggressor" fighters. A total of 15 of these aircraft were part of the initial batch of 30 aircraft produced by Northrop. In 1990, FAB retired all remaining five F-5Bs; later, they were sent to Brazilian museums around the country.
In 2001, Elbit Systems and Embraer started work on a $230 million Brazilian F-5 modernization program, performed over an eight-year period, upgrading 46 F-5E/F aircraft, re-designated as F-5EM and F-5FM. The modernization centered on several areas: new electronic warfare systems, the Grifo F radar, an air-to-air refueling system, INS/GPS-based navigation, support for new weapons, targeting and self-defense systems, HOTAS, LCD displays, helmet-mounted displays (HMDs), Radar Warning Receiver, encrypted communications, cockpit compatibility for night vision goggles, On-Board Oxygen Generation System (OBOGS) and various new onboard computer upgrades. One important capability is the secure communication with R-99 airborne early warning platforms and ground stations.
Externally, the new aircraft features a larger nose cone that accommodates the larger radar equipment. The first F-5EM was handed over on 21 September 2005. On 7 July 2003, four Rafael Litening III targeting pods were ordered at a cost of US$13 million, to be used on F-5M together with three Rafael Sky Shield jamming pods ordered on 5 July 2006 at a cost of US$42 million.
In 2009, FAB bought eight single-seat and three twin-seat F-5F used aircraft from Jordan in a US$21 million deal. These aircraft were built between 1975 and 1980. On 14 April 2011, a contract of $153 million was signed with Embraer and Elbit to modernize the additional F-5s bought from Jordan, and to supply one more flight simulator as a continuation of the contract signed in 2000. These F-5s will receive the same configuration as those from the initial 46 F-5s currently completing the upgrade process. The first delivery of this second batch of upgraded jet fighters is scheduled for 2013 with expected use to 2030.
Northrop F-5