Why You Cannot Take Designation Force and Recon Element Together

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What to build instead

If you want the marking effect, take Designation Force (1 DP) and spend the other 2 DP on something that shoots:

[Siege Regiment](/40k/armies/astra-militarum/detachments/siege-regiment) (2 DP) is the strongest fit in the faction, and we have written the full list up. Artillery Support punishes enemy units more than 12 inches from your army, and designation is precisely the tool for hitting things in that band.
[Hammer of the Emperor](/40k/armies/astra-militarum/detachments/hammer-of-the-emperor) (2 DP) is the mobile version: eyes in front, tanks Advancing a guaranteed 6 inches behind them.
[Steel Hammer](/40k/armies/astra-militarum/detachments/steel-hammer) (2 DP) completes a super-heavy's range coverage. Ceaseless Cannonade solves shooting at things that are too close; designation solves shooting at things that are too far.

If you want the Stealth, take Recon Element (2 DP) and add a 1 DP detachment that is not RECON:

[Bridgehead Strike](/40k/armies/astra-militarum/detachments/bridgehead-strike) (1 DP) is the best answer. It carries no Unique Tag at all, so it is always legal, and army-wide Stealth covers exactly the turns before your Scions land, which is when a drop list is most exposed.
[Abhuman Auxiliaries](/40k/armies/astra-militarum/detachments/abhuman-auxiliaries) (1 DP) carries ABHUMAN, a different tag, so it pairs freely. Stealth on a slow, expensive Ogryn brick crossing open ground is worth more than on almost anything else in the army.

And one pairing that looks blocked and is not. [Mechanised Assault](/40k/armies/astra-militarum/detachments/mechanised-assault) shares the Reconnaissance Force Disposition with both of these detachments, which leads readers to assume a third RECON detachment exists. It carries no Unique Tag in the Faction Pack, the Munitorum Field Manual or Wahapedia, and it pairs freely with either of them. A Force Disposition affects which missions you play; a Unique Tag restricts which detachments you can combine. They are different things that happen to appear next to each other on the same page.

The faction's other blocked pairing teaches the same lesson from the other direction: Abhuman Auxiliaries and Grizzled Company share the ABHUMAN tag. Read that page too. In an Astra Militarum army, when two detachments look designed for each other, check the Unique Tag first.

Common questions

Can I take Designation Force with Recon Element?

No. Both carry the RECON Unique Tag, and no two detachments in your army may share a Unique Tag. Faction Pack v1.2 prints UNIQUE: RECON above the Designation Force page and restates the restriction inside its rule text, and both the official Munitorum Field Manual and Wahapedia record the tag on both detachments. No source disagrees.

But they only cost 3 DP together. Isn't that legal?

The Detachment Points do fit exactly, and that is what makes this trap convincing. Legality has two independent tests: you must be within your DP budget, and no two detachments may share a Unique Tag. This pairing passes the first and fails the second. The arithmetic working is not sufficient.

Wahapedia says Recon Element is 3 DP. Which is right?

The official Munitorum Field Manual says 2 DP, prints a decrease marker beside that value and renders the whole entry in its changed style. Wahapedia still shows 3 DP because the mirror is a revision behind and still records Faction Pack version 1.1 rather than the current 1.2. We follow the official document. It does not change this pairing's legality either way, because the shared RECON tag blocks it at either price, but it does change whether Recon Element can take any partner at all.

Why did Games Workshop block two detachments that do different things?

Because they do different things that are both non-offensive. Designation Force adds no damage and no defence; it makes the rest of your army shoot the right targets. Recon Element also adds no damage; it is concealment, repositioning and disruption. A list made of both would have excellent information and excellent survivability and almost no offensive output. The tag prevents a bad list that looks clever rather than a broken one.

Can I take Mechanised Assault with either recon detachment?

Yes, with both. Mechanised Assault shares the Reconnaissance Force Disposition with Designation Force and Recon Element, which is why readers assume it is a third RECON detachment, but it carries no Unique Tag in the Faction Pack, the Munitorum Field Manual or Wahapedia. A Force Disposition affects which missions you play; a Unique Tag restricts which detachments you can combine.