As modern air combat environments become increasingly contested and digitally driven, electronic warfare (EW) systems are emerging as a decisive factor in ensuring aircraft survivability and mission success. At the forefront of this evolution is L3Harris’ Viper Shield™ AN/ALQ-254(V)1 and (V)2, an advanced all-digital EW suite developed for the F-16 Block 70/72 fighter aircraft. Designed in partnership with Lockheed Martin and the U.S. Air Force, the system combines digital radar warning, advanced jamming capabilities, and deep aircraft integration to counter rapidly evolving threats. In this interview with Arabian Defence, Travis “Posum” Ruhl, Director, International Business Development, L3Harris and a former F-16 pilot, discusses the system’s operational advantages, scalability, global adoption, and the future of electronic warfare in modern combat operations.
Could you give us an overview of the Viper Shield programme and where it currently stands?
Viper Shield is one of the most advanced electronic warfare systems currently available for the F-16 platform. It has been selected as the baseline EW suite for the latest F-16 Block 70 aircraft and is offered in three configurations, as an internal baseline system for new Block 70 aircraft, as an upgrade package for existing fleets, and as a podded solution. Importantly, all three variants share common line replaceable units (LRUs), which simplifies logistics, maintenance, and long-term sustainment.
We are currently at a very exciting stage in the programme. Recently, Peru became our eighth international partner by selecting Viper Shield for its F-16 Block 70 fleet. In addition, Poland became our first upgrade customer earlier this year.
At present, we are preparing to ramp up production for 233 systems. That is a major milestone because it demonstrates the maturity of the programme and provides confidence to future operators. No other F-16 electronic warfare programmes worldwide can claim to be in production at this scale.
The threat environment we are witnessing today, particularly from conflicts in Ukraine and the Middle East, clearly highlights the growing importance and necessity of advanced electronic warfare capabilities. We often describe Viper Shield as “electronic armour” for the F-16. Its fully digital architecture enables the system to detect and process multiple threats simultaneously and respond almost instantaneously.
Electronic warfare is evolving rapidly. What differentiates Viper Shield from other EW systems available today?
One of the biggest differentiators is maturity. We are more than five years into development, the system is already in production, and it is expected to be operational on aircraft by 2027. That is a long journey to go through and we come out the other side with a highly integrated system.
Over the past several months, extensive testing has validated both the performance of the system and its integration with the F-16 platform. Viper Shield integrates seamlessly with the APG-83 AESA radar and has exceeded expectations during testing at Lockheed Martin integration laboratories and U.S. Air Force facilities. The low risk mature system is the first biggest differentiator.
Another major advantage is that the system is fully digital and software-defined. Legacy EW systems were often static, once fielded, adapting them to evolving threats was extremely difficult. Viper Shield was designed differently. It is built to evolve alongside modern threats through both software and hardware upgrades.
The system combines advanced digital radar warning receiver (DRWR) capabilities with digital radio frequency memory (DRFM)-based jamming in a fully integrated package. This allows pilots to detect multiple threats simultaneously and respond almost instantaneously.
Most importantly, much of the process is automated, reducing pilot workload and significantly improving survivability in highly contested environments.
What operational gaps or evolving threat scenarios led to the development of Viper Shield?
The importance of electronic warfare has been recognised for decades, particularly since the Vietnam era. However, as threats evolved and became increasingly digital, there was a clear requirement for a next-generation EW system capable of responding to that shift.
When Lockheed Martin and the U.S. Air Force developed the Block 70 F-16, they wanted an EW system deeply integrated with the aircraft’s avionics and sensors. Viper Shield was designed specifically to meet that requirement.
A key strength of the system is that it combines radar warning and jamming functionality into one integrated solution. The threat environment today is highly dynamic, and traditional analogue systems simply cannot react quickly enough. Viper Shield’s digital architecture allows it to adapt to modern and emerging threats in real time.
Peru recently selected Viper Shield for its F-16 Block 70 fleet. Could you elaborate on the growing international interest in the system?
Absolutely. Peru’s selection is very significant because it marks another major step in expanding the global F-16 family equipped with Viper Shield. Peru selected 12 F-16 Block 70 aircraft along with the Viper Shield EW suite as part of its fighter modernisation programme.
Poland also selected Viper Shield as part of its F-16 upgrade initiative tied to Lockheed Martin’s service life extension programme.
Beyond these announcements, six original Block 70 customers have already selected the system. Altogether, this growing customer base demonstrates confidence in both the technology and the long-term sustainability of the programme.
L3Harris is increasingly investing in AI-enabled defence technologies. How is artificial intelligence shaping your electronic warfare solutions?
Artificial intelligence and machine learning are becoming foundational to modern defence systems, particularly in electronic warfare where the amount of data being processed is enormous.
At L3Harris, we are working on initiatives such as Distributed Integrated Spectrum Collaboration Operations, or DISCO, which focuses on sensing the EW environment, understanding it, and responding rapidly.
AI, especially agentic AI, plays an important role in helping operators interpret large volumes of electromagnetic spectrum data. Human operators remain central to decision-making, but AI-enabled tools can assist in identifying threats, recommending responses, and even supporting rapid reprogramming of EW systems as adversaries adapt.
As conflicts evolve, adversaries will inevitably modify their tactics and wartime modes. The ability to quickly update and adapt EW responses will become increasingly critical.
How scalable is the Viper Shield architecture for future upgrades and next-generation threats?
Scalability was a core design principle from the very beginning.
The system has additional processing capacity already built in, allowing future growth without major redesign. Many enhancements can be implemented purely through software upgrades, which significantly reduces cost and integration time.
Viper Shield is also built around a compact 3U VPX architecture using commercial off-the-shelf technology, enabling easier future modernisation. There is room for additional processing cards, country-specific capabilities, and even expanded apertures if required in the future.
That flexibility ensures the system remains relevant as threats continue to evolve over the coming decades.
How do you assess the Middle East market for advanced EW solutions such as Viper Shield?
The Middle East and North Africa region remains one of the most important markets for the F-16 platform because of the large number of operators in the region.
We already have two Viper Shield customers there, and we see substantial opportunities both for new Block 70 acquisitions and for upgrades to existing fleets.
One of the strengths of Viper Shield is that the same hardware architecture supports both new aircraft and retrofit programmes. That commonality allows operators to leverage the benefits of a mature production line and a programme that has already seen nearly a billion dollars in investment.
Looking ahead, how do you see defence technologies evolving over the next decade, and where is L3Harris focusing its investments?
As the “Trusted Disruptor,” L3Harris is firmly focused on the future and on delivering advanced capabilities rapidly to both the US Department of war and our international partners worldwide.
One of the biggest changes we will see over the next decade is the increasing pace at which threats evolve and, equally importantly, the speed at which defence systems must adapt to counter them. Modern warfare is becoming far more dynamic, which means defence technologies will need to evolve faster than ever before.
Another major shift will be in the cost and accessibility of precision effects and munitions, particularly in the counter-UAS space. This is an area where L3Harris has significant strength. We expect the cost-per-shot for many systems to decrease substantially as technologies become more scalable and operationally efficient.
L3Harris has already been investing heavily in this domain, including systems such as VAMPIRE, which has demonstrated strong operational effectiveness in both Europe and the Middle East.
At the same time, there will be growing demand for trusted industry partners capable of delivering integrated capabilities across multiple domains from munitions and counter-UAS technologies to advanced aircraft integration and electronic warfare solutions.
For me personally, Viper Shield represents one of the most advanced and adaptable fighter electronic warfare capabilities available today, with the flexibility to evolve alongside future threats and operational requirements.
Finally, how optimistic are you about Viper Shield’s role in shaping future air combat operations?
I am extremely optimistic. The fact that eight international customers have already selected the system speaks volumes.
Modern combat environments are becoming increasingly unpredictable and threat-intensive. In such an environment, having a mature, combat-ready, and adaptable EW system is essential.
What makes Viper Shield particularly powerful is its ability to function as “electronic armour” for the aircraft. By automating complex EW tasks, it allows pilots to focus on the mission while the system manages the electronic threat environment in real time.
Ultimately, survivability is everything. As a former F-16 pilot, that is what matters most to me ensuring pilots can successfully complete their missions and return home safely.
