if you do not have gold tech on your osirus he will move forward to far and draw fire. All you need is level 10 ghost with gold tech on thats it. But Osirus also needs gold tech if that is not on just remove him from the group leave him on the map as you get a bonus aura from him but keep him behind you.
I have lvl 16 ghost with all tech on but I still get hit by the big tank in officer 2 base
if you do not have gold tech on your osirus he will move forward to far and draw fire. All you need is level 10 ghost with gold tech on thats it. But Osirus also needs gold tech if that is not on just remove him from the group leave him on the map as you get a bonus aura from him but keep him behind you.