In Tanks I can suicide kill one of my soldiers so that a friend can get in as driver for example.
Would be nice to have the ability to spawn in Vihicles like Ju-87 because otherwise you have to land it 
The co-op tanks is not something limited to friends. Allies with bad intent can do so too. That’d need fixing first.
Also with the plane you can’t actually use the rear gun, the back gunner only serves as a respawn.