EP-3 Series

The EP-3 Series line item in the Department of the Navy's Aircraft Procurement budget has historically funded modifications to the EP-3E aircraft, a land-based, long-range signals intelligence (SIGINT) platform. The primary goal of this program was to ensure the continued operational viability and mission effectiveness of the EP-3E fleet in the face of evolving threats, system obsolescence, and emerging cybersecurity requirements. As the EP-3E approached the end of its service life, these funds were crucial in bridging the gap until a suitable replacement, specifically the MQ-4C Triton IFC-4, could be fielded in sufficient numbers and capability.

The principal active modification program under this line item focused on the Joint Airborne Signal Intelligence Architecture Modification Common Configuration (JCC), which provided spiral upgrades to the EP-3E's mission systems. The program incorporated Engineering Change Proposals to address obsolescence, enhance electronic support measures, modernize signal exploitation and processing, and improve display techniques. These upgrades included enhancements to classified communications, expanded special signal processing capabilities, and compliance with cybersecurity and cryptographic mandates from the National Security Agency.

The JCC program was designed as an evolutionary acquisition, allowing for rapid integration of Quick Reaction Capability mission systems. This flexibility enabled the EP-3E to respond in real-time to new and emerging threats by upgrading avionics, software, and cryptographic equipment. The program also supported associated training systems, logistics, and test equipment, ensuring that aircrews could effectively operate and maintain the upgraded systems. The overarching objective was to maintain a SIGINT platform that could meet current and anticipated operational demands until the MQ-4C Triton was fully operational.

In FY 2024, the program's focus was on addressing mission system obsolescence, improving the cybersecurity posture of the platform, and implementing SIGINT modifications required to counter dynamic electronic warfare threats. These efforts were in direct response to legislative requirements, specifically the FY11 National Defense Authorization Act, which mandated the retention of the EP-3E until a replacement with equivalent capability and capacity was fielded. The Navy authorized a three-year extension of the EP-3E through FY 2024, with a planned sundown by mid-FY 2025.

Inactive investments represent prior-year efforts in operational improvements and modernization that are no longer active but contributed to the mission viability of the EP-3E fleet. These included a range of upgrades and modifications implemented in earlier years. While these activities are now complete, they played a significant role in sustaining the platform's relevance during its extended service life.

As the EP-3E airframe reached an average age of 50 years, the program's objectives shifted toward ensuring a safe and effective transition out of service. The FY 2025 budget reflects the conclusion of modification efforts, with no new procurement or installation funds requested. The Navy's plan is to reduce the active Primary Aircraft Authorization inventory to zero by the end of FY 2025, marking the end of the EP-3E's operational role.