The company was formed from the merger of L3 Technologies and Harris Corporation on June 29, 2019,[3] which made it the sixth-largest defense contractor in the United States.

In 1967, they merged with Radiation, Inc. of Melbourne, Florida, a developer of antenna, integrated circuit, and modem technology used in the space race.

[13] Between 1999 and August 2021, L3Harris and predecessors spent $131.9 million lobbying for ICE radio procurement ($20,000),[14] the Intelligence Authorization Act ($​1,510,000),[15] DHS fund appropriations for unmanned vehicles ($430,000),[16] and night vision systems research ($20,000).

[17][18] In 2008, 72 Iraqi civilians sued L3 Services and CACI for human rights violations including "torture; cruel, inhuman, or degrading treatment; war crimes; assault and battery; sexual assault and battery; intentional infliction of emotional distress; negligent hiring and supervision; and negligent infliction of emotional distress."

A settlement was reached on October 10, 2012, which was the "first positive resolution to a U.S. civil case challenging detainee treatment outside the United States in the larger 'war on terror' context".

[19] In 2012, L3 subsidiary KDI Precision Products participated in the sale of 11,500 JDAM bomb fuzes to Israel, part of a $647 million contract deal.

[31] In June 2022, it was reported to have held talks to purchase the Israeli company NSO, which builds Pegasus spyware.

Services and equipment help support surveillance and reconnaissance with autonomous surface vehicle, monitering, signal & control systems.

The initiative and prototype combine commercial technology to provide the United States military with collaborative autonomy when operating swarms of unmanned aircraft, ground vehicles, and marine seacraft.

[1] Headquartered in Palm Bay, Florida, Aerojet Rocketdyne consists of two sectors: "Missile Solutions" and "Space Propulsion and Power Systems".