So, with the new 5e wound allocation rules and the rumored Storm Shield rules change, something interesting happens if you can take one on a Veteran Sergeant.
Let's say you have a Combat Squad, 5 men, and you take fire from another 5-man Combat Squad with four Bolters and a Plasma Gun. Let's just say you get four wounds from the Bolters and one from the Plasma Gun. Now, per the wound allocation, you'd allocate one wound to the sergeant, one to your special weapon trooper, and then three to the other three models in the unit. By conventional tactics you'd just whack one of the normal marines without a save, and roll for everyone else. However, if the sergeant has a Storm Shield, you give him the plasma wound (which he gets a 3+ invulnerable save to), and the rest to everyone else (which they get 3+ armor saves for). As a result, you don't
risk anything extra by giving the dangerous wound to the sergeant -- he'd be taking a save anyway, since you have to allocate one to him.
So, then add a plasma wound to the mix. You could then assign it to the sergeant too, so he'd take two 3+s, or you could give it to one of the normal marines, ensuring his death. That's where you have a choice -- if the sergeant's worth protecting because of gear. But if you
only take the Storm Shield on the sergeant, there's little reason
not to give him extra wounds to save other marines.
Given how a significant portion of low
AP shots come in (mixed with higher
AP shots; e.g., a Combat Squad firing Bolters and a single Plasma Gun), the Storm Shield on the squad effectively gives the
entire squad its 3+ invulnerable save until the save is failed. And if you don't take any other upgrades on the sergeant, there's no additional cost (or, more specifically, risked point cost) beyond the cost of the Storm Shield as the Veteran Sergeant upgrade is free.
Of course, you can still add other things without increasing the risk of assigning extra wounds to the sergeant -- any wargear that's either one shot (e.g., Combiweapon), or something you expect to use only early in the game (e.g., Teleport Homer) doesn't add to the risked value of the sergeant when extra wounds are assigned to him.
Damnit, if this holds up, I'm laying claim to Storm Shield/Combiweapon equipped Veteran Sergeants as Lowinor pattern
...
And then Space Wolves can do some pretty crazy things. Considering that any Wolf Guard can take a Storm Shield for 5 points (whether a pack leader or a bodyguard), especially with the
FAQ telling us Wolf Guard Battle Leaders can buy Wolf Guard heavy weapons.
So, take a Wolf Guard Battle Leader, give him a 4 man bodyguard, that's 160 points base.
Give them all Terminator Armor, 35 for the squad.
Hand out three Assault Cannons for 60 points (two of them to the bodyguard, and the
WGBL gets one, too)
So we're at 255 points for a squad with 2+/5+ saves, two BS4 Assault Cannons and one BS5 Assault Cannon.
Then, for 30 points each, there are some ugprades here:
Give them all Runic Charms, 30 for the squad (reroll an armor save once per game each).
Give them all Storm Shields, 30 for the squad (a bargain for 3+ invulnerables).
And then 30 points buys Power Fists for the two models without
ACs.
345 points for a 5-man squad with 2+/3+ saves (and a reroll on the 2+ once per model), two BS4 Assault Cannons, one BS5 Assault Cannon, and two Power Fists.