Blows up the tank regiment HQ with Storm Shadow
Seriously, a programmable, self acquiring missile with a 24km (or whatever Brimstone II actually has) range, is a pretty good addition to AT, capability and very useful against other targets like SPAAGs, SPHs etc. The obvious problem is it currently relies on Typhoons to launch it which would be highly problematic vs a peer opponent with good GBAD, let alone air supremacy. It would be really handy to have a ground launched version and have it on attack Helos. JAGM is essentially Brimstone II Lite.
The nice thing about HQ's, when they are functioning that is, is that they dont tend to move.......
A tank regiment HQ is going to be composed largely of armoured vehicles. They will not stay put for long. Even if they did, are you going to use one of a relatively tiny number of hugely expensive 300+ km range, unitary penetrating warhead (BROACH no less) ALCMs on it? This is going to take time to programme the missile for which you will need target imagery and, IIRC, it can only be done on the ground prior to take off - you had better hope that the enemy doesn't move anything around or leave the target area by the time the missile arrives. Assuming it does, it will make one, not very significant hole in the ground. Now lets look at the alternatives - how about just lobbing a quick reacting, battery level 155mm concentration on it - preferably with SMaRT or BONUS in the mix or perhaps one or two SMaRT carrying GMLRS? What advantage does StormShadow have over that?