Alpha11 (there is a use for cyborgs
first 2 transports cyborg gunners when both are landed you rush them past the two scav bases to where you head out into the middle east/west trail - scavs are mostly rocket units / defenses and we know that doesn't do much to cyborgs. You should be there before the heavy tanks carrying the artifact - the cyborgs annihilate these and you get the artifact (now you are not rushed anymore). You can use the initial 10 Borgs to get the artifact but will likely need more to kill all the tanks to trigger the return to LZ.
Here is the image from the original walkthru - ignore the units. This is the area that you rush your cyborgs to - where is says NP Exit, this is where you will send your cannon / bombard units
lancer tanks. Very soon the fleeing tanks will appear, you should take out the lancers first and then work on the heavy tanks with your gunner borgs.
I feel Cyborgs were originally meant to be used for this stage of the mission due to all the rocket units encountered... just my opinion.
While all this is going on you ship in bombard and medium cannon
lancer units you can do it with 10 but take more if you want, with these move up the middle entrance (NP Exit on image) towards the enemy lz (you don't go the north passage as it is heavily guarded and sucks too much time) and kill all units there.
Once you destroy all the units there you should be called to return to the lz - if you are strapped for time to get them back it is a good idea to bring in a truck and build a repair facility and then recycle them making sure you have one unit at the lz (I didn't need to do this).
To trigger the return to LZ you must kill all units this includes fleeing units so if it is not triggering there is a unit somewhere. You do NOT need to destroy the scav bases, in fact it is better to just ignore them.