If front line aircraft are all UAVs for air combat. There're two cases:
1. Man-in-the-loop: Comms will be intercepted & jammed in real combat. How can you guarantee your comm not be jammed? A typical way is to place a man nearby, which is Loyal Wingman strategy, also one of NGAD features. This requires your whole fleet are stealth to some extent. If men are all far away from UAVs, once comm is jammed, you'll lose your entire fleet. These vulnerable UAVs are significantly inferior to manned stealth fighters.
2. Man-not-in-the-loop: That is to say, front line UAV groups are controlled & self-organized by real AI. But sorry to tell you, today's AI is not mature enough, can't make complex & sensitive decisions correctly, such as complying with engagement rules, how to identify friend-or-foe, how to distinguish between enemies & civilians, how to decide priorities of tasks & targets. This is consensus of all powers. That's why current in-service UAVs are all remotely controlled by someone from rear/nearby.
In conclusion, a completely unmanned air force is not feasible. UAV is more of a supplement to manned air force.
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