How come I found an article dated 2017 discussing "HEF" ?
"Staff Sgt. Steven Schrader (left) and Staff Sgt. Alex Rini, 412th Logistics Test Squadron, discuss the progress of the C-17 portion of the Hybrid Electric Flightline Cart Technology Pathfinder tests. The nearly zero noise of the HEF allows maintainers to converse without the use of the aircraft’s internal communication system. (U.S. Air Force photo by Christopher Ball) PHOTO DETAILS / DOWNLOAD HI-RES 1 of 3 Staff Sgt. Steven Schrader (left) and Staff Sgt. Alex Rini, 412th Logistics Test Squadron, discuss the progress of the C-17 portion of the Hybrid Electric Flightline Cart Technology Pathfinder tests." https://www.edwards.af.mil/News/Article/1093256/team-tests-ground-equipment-concept-demonstrator-here/
Here is another article suggesting PCTI already has manufactured it ???
That’s just 1 contract . Don’t forget there are many others they already sell too and the Direct Energy Weapon bid they have been working on. Could be well over the $400 million mark. ;)