A cadre of pilots and maintenance personnel began completing retraining to master the skills necessary to fly and maintain the new aircraft back in 2021. A number of construction projects began in October 2023 to renovate existing facilities and build new facilities to support the new airframe. The 125th Fighter Wing received its first F-35 Lightning II in March of 2025; the unit will continue receiving additional aircraft in several batches.

The Wing received its first F-35s in March 2025; additional aircraft will be continue to be received in several phases.

The DoD has an extensive process for base selection that takes into account several variables. Early in the selection process they accomplish an Environmental Impact Study to weigh negative impacts due to the change in aircraft. In addition to the environmental studies, they look at proximity to training airspaces, as well as overall base viability. In 2020, after three rounds of consideration, the Secretary of the Air Force selected the 125th Fighter Wing to covert to the new airframe which began our beddown initiatives in the fall of 2020.

To ensure the installation is ready to receive the new aircraft, several renovation and construction projects were contracted. In October 2023, construction began on a Full Mission Simulator Building that will give the pilots the ability to train to the full spectrum of threats. In 2024, the M-1 taxiway at Jacksonville International Airport was widened to accommodate the larger aircraft. Construction for a Combined Weapons Facility which will allow our maintainers the ability to train on weapons loading and unloading independent of weather conditions will also begin shortly. Additionally, there are smaller construction projects to house practice munitions as well as modify work spaces to account for a redistribution of certain career fields within maintenance.

All pilots, a majority of maintenance and some logistics personnel required retraining in order to learn the F-35's unique systems. In October 2022, a core cadre of maintenance personnel began retraining to become familiar with its specific systems, components, and maintenance procedures. Upon completion of training, they returned to the 125th FW to ensure all conversion-affected maintenance personnel are proficient through on-the-job training and continuous learning.

The conversion to the F-35 is a necessary upgrade to maintain relevancy in today’s threat environment. The F-35 brings stealth capabilities and a sensor package that enables it to operate in areas that 4th Generation aircraft simply cannot. The Air Force needs F-35 squadrons available and fully mission capable to prevail against peer adversaries under contested logistics, during contingency operations, and to produce sufficient readiness during peacetime training. Basing F-35s are the 125th FW ensures Airmen will continue to have a strategic advantage as the unit enhances Agile Combat Employment (ACE) capabilities and global combat readiness. 

The conversion brings an estimated construction/renovation costs in excess of $100M. Local businesses will have opportunities to participate in those infrastructure upgrades through normal contracting and solicitation processes. Additionally, the number of personnel serving at the 125th Fighter Wing will remain largely unchanged with pilots and the majority of maintenance and logistics personnel undergoing retraining to be able to support the new airframe. Regarding public safety, the F-35s stationed at Jacksonville International Airport will continue to operate in much of the same way it has in the past – discretely and without an obvious presence to the people of Jacksonville. The F-35 does bring with it an increased focus on Air-to-Ground target discovery and identification. This means that there will be more flights conducted in existing range spaces within the state of Florida – but no new ranges are anticipated to be required.

The F-35 noise profiles were compared with existing F-15C noise profiles during the Environmental Impact Study conducted in 2016. Those noise profiles demonstrate that there will be a slight increase to noise in the immediate proximity to the airport (at lower power settings) than the F-15C. However, takeoffs, en-route flight, and training in the airspace will continue to be minimally different from F-15 operations conducted over the last 20 years.

Some of the F-15Cs with the latest upgrades and the most life left on them were transferred from the 125th Fighter Wing to other F-15C units to augment them. The remainder of the jets were retired to the "Boneyard" at Davis Monthan Air Force Base, Arizona, where they were moth-balled and stored in the desert with other retired aircraft.