The smartest part of a fire-and-forget missile is the option not to forget

In short: “fire-and-forget” sounds like the ideal anti-tank missile, but it locks the shooter into one decision at the moment of launch. Rafael’s Spike family added a fiber-optic or radio link so the operator can keep watching, change targets mid-flight, and hit what was never visible from the launcher.

Ask most people what makes a modern anti-tank missile clever and they will say autonomy. You point, lock, fire, and run while the seeker does the rest. That is a real advantage. It is also a trap.

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A missile that locks on before launch can only attack something the shooter already sees. If the target ducks behind a building, if a second vehicle turns out to be the real threat, or if the first one is a decoy, the decision is already made and the missile is committed.

Lock-on before launch versus lock-on after launch

The Spike, developed by Rafael Advanced Defense Systems and now in its sixth generation, works both ways. In basic mode it is a classic fire-and-forget weapon with an imaging infrared seeker. The long and extended range versions add a second mode Rafael calls “fire, observe and update”, known more generally as lock-on after launch.

Here the missile trails a fiber-optic wire that spools out behind it. The seeker’s video comes back down that wire to the operator, who can pick a target only after the missile climbs high enough to see it, switch to another target in flight, or correct the aim if the tracker loses its grip.

That changes the geometry of the fight. The shooter can fire from behind a ridge at a target below the line of sight, using the missile itself as a forward observer.

How the family scales with range

The figures below come from published specifications summarized on Wikipedia. Notice how the data link changes as distances grow: wire works at infantry ranges, radio takes over when the wire would have to be absurdly long.

What a human in the loop actually buys you

Keeping the operator connected costs something. The shooter has to stay focused on the screen during the flight instead of relocating immediately. In return, the weapon gains abilities a fully autonomous seeker cannot offer:

• Engaging targets hidden from the launcher, behind a hill or a building.
• Switching to a higher-priority vehicle after launch, or aborting if civilians appear near the aim point.
• Firing speculatively toward a likely position and choosing the actual target on the way.
• Battle damage assessment from the seeker video, right up to impact.
• On the NLOS 6th generation, handing control to another platform after firing.

The arms race with active protection

Tanks did not stand still. As tank armor stopped getting thicker, designers moved to active protection systems that detect an incoming missile and shoot it down or jam it in the last fraction of a second. The logic is the same one that drives making a missile miss rather than out-armoring it.

Rafael’s answer on the LR2 was a counter-active-protection capability: the missile can strike at impact angles of up to 70 degrees, diving steeply onto the roof, where armor is usually thinnest. The LR2 also gained an option to fly to grid coordinates passed from a third party, using an inertial measurement unit, before the seeker takes over.

For a technical overview of each variant and its operators, see the Spike missile entry on Wikipedia.

Next time you read a spec sheet that leads with “fire-and-forget”, check the second line. Look for whether the operator can still see through the seeker after launch. That single feature decides if the weapon can only hit what you see, or also what you suspect.