The infrared instrument was integrated into a Millennium Space Systems satellite, which will lift off on 30 June.
The 365lb, 6ft-tall payload was developed in Wilmington, Massachusetts.
The infrared instrument will enhance the ability to capture crucial battlefield information and high-resolution imagery from the space.
This ability will also support the future missile defence initiatives of the US.
L3Harris Space & Airborne Systems president Ed Zoiss said: “The L3Harris instrument can stare continuously at a theatre of interest to provide ongoing information about the battlespace, which is an improvement over legacy system.
“It also provides better resolution, sensitivity and target discrimination at a lower cost.”
The infrared instrument is part of a wide-field-of-view satellite, that will provide information related to future space-based missile defence missions.
The satellite will be positioned approximately 22,000 miles from the Earth.
It will allow the infrared system to capture a range of swath and will also enable patrolling a large area for potential missile launches.
According to L3Harris, it is focused on making investments in space-based missile defence programmes.
The company is working on the development of end-to-end resilient satellite solutions in spacecraft, payloads and ground software.
In 2019, L3Harris received a missile-tracking study contract from the Missile Defense Agency (MDA).
Following the initial stage, the company later secured a second phase contract for the hypersonic and ballistic tracking space sensor (HBTSS) programme in December 2019.
L3Harris completed the critical design review of the HBTSS prototype in December last year.