When I first read about Al'Rahem, my initial impression was "wow, lets you outflank with a huge platoon, and lets you move and fire!" Of course I thought of moving in to rapidfire, then moving back out of assault range and perhaps back into cover. However, after some thinking, some additional uses came to me.
If the squad doesn't move in the movement phase, they could fire their heavy weapons and shoot their rifles 24", then move a
d6". This effectively gives the squad "Slow and Purposeful".
Imagine a platoon outflanking with
AC/Plasma, perhaps a 45man platoon merged into 2 squads of 20. When they come on order them to Move! so they get closer (or not if you're already close enough).
Next turn shoot with all your guns at max range and then move a
d6" with both squads. This will let you still move to objectives while laying down some nice shots against side armor (or enemy troops).
If they start moving to you, don't worry, you can still shoot at full effect and move back away from the enemy
And if you don't feel like moving, just using Bring It Down! (Al has it) and hit them where it hurts
I honestly think Al'Rahem has some seriously dangerous potential and am looking forward to trying him out (w/ Astropath of course). Combined with some outflanking Valks/Vends and you can wreak some havoc.