I don’t know that much about the one that crashed, but an F-35B used for training might not be as up to date as a newer or more frontline jet and might also be more accessible to a wider variety of people.
I guess we’ll have a clue if they are grounded.
This particular plane belonged to the Marine Corp, they did issue a 2-day stand down to all F-35s in their inventory.
I know this sound farfetched, but worth talking about, I can’t get over how the plane kept flying after the pilot ejected and the military didn’t know where the plane was for a period time.
Maybe my concerned is unwarranted, but if an experienced pilot ejects, I assumed the plane was just about to crash and couldn’t be recovered, in this case the pilot ejected and the plane kept flying.