WGR mechanic

[UllyB 1,206]

Trying not to complicate too much things with Hellfire missiles for a helo, I set them as WGR. They work fine, but the wingmen say , when I tell them to engage ground targets  that they are "out of ammo". Any idea why ? Is WGR "mechanic"  not coded for A.I. wingmen ? If I can use them , A.I. should use them too, right ? I suspect that WGR don't need any avionics at all. Am I wrong ? Thank you in advance.

[UllyB 1,206]

Correction:

No.2 says : OUT OF AMMO

No.3 (&4) says: ENGAGING TARGET but he does nothing.