When the radar bleep tells the operator its an F-15 incoming, a little planted device on the vertical tail wing of the F-35 root sends a F-15 like profile back to that radar indicating its not an F-35 to the operator.
Advantage, F-35 since it became as visible as an F-15. Stealth aside this little nuance confuses what defenders need when the F-35 is coming in.
"The notched bumps, which are called , serve a purpose."
To confuse and obfuscate is the new weapon. The Navy version will not have this version. I would expect this to be a plug and play feature used in combat as conditions warrant its need since it exposes it as an object entering the battle space. Not all F-35 will have this capability as invisibility is also a needed advantage. More importantly, this signals a maturity of the F-35 program. The military has begun its ad hoc experimentation on how this frame can be modified for all combat condition. The plug and play phase of weaponizing under all conditions has begun. The period the F-35 has entered will continue throughout its life cycle going forward.