In Project Delta, a rig stop most likely means a rigging or extraction stop tied to helicopter movement, not a gameplay combat mechanic. In the Project DELTA Vietnam context, the unit used helicopter extraction gear like the McGuire rig and STABO rig to pull people out of places where landing wasn’t possible.

What it means

  • A rig is the sling/harness used for hoisting or extracting a person.
  • A stop usually means the point where the movement or pickup is halted, often because the person is being secured, checked, or the extraction is complete.
  • In this context, it’s basically the “hold here” moment during a rig pickup or drop-off.

In plain terms

If someone says “rig stop,” they’re probably referring to the brief pause in a helicopter extraction sequence when the rig is stabilized before the next step. That fits the historical use of extraction rigs in Project DELTA operations.

If you meant the game

If you meant Project Delta the Roblox game, “rig stop” could be a player- made term or a mechanic nickname, but I couldn’t verify a standard official definition from the sources available here.