As a USF main,( the only faction I play where I feel T0 MGs properly screw me over) I'd be happy if they just unlocked USF grenades when the player upgrades to LT or Captain.
Right now between the Ambo, rushing to LT for my own MG and rushing for WR for some AT (I just find lacking MG's too hurtful to go CApt especially with the sub-par AT gun, so I rely on zooks until my tanks come out) theres too many competing fuel priorities for me to get an MG counter without losing ground to light vehicles or visa versa.
Remove the grenades upgrade and tie it with Lt/Capt?
so LT or Capt tech = "free" unit + "free" grenade search ? all this without needing a RE to build a building