Tactical training round

From Halopedia, the Halo wiki

For other types of non-lethal ammunition, see stun round.
Halo 4: Forward Unto Dawn screenshot
April Orenski firing TTRs at Thomas Lasky.

Tactical training rounds (TTR), also known as tactical lockup rounds (TLR)[1] and occasionally referred to as stun rounds,[2] are a type of training ammunition used to simulate live fire.[3]


The TTR has a plastic polymer shell that helps maintain the actual characteristics of bullet flight. Inside, there is a proximity fuse that dissolves the shell when the round comes within 10 centimeters of a surface. Once dissolved, a blob of red paint splatters onto the target. The paint also hides a powerful anesthetic, capable of knocking a target unconscious for hours depending on the area hit, and immobilizes the nano-fibers woven into training clothing, causing it to harden. The target then loses the ability to move the body part that is hit, simulating a bullet wound to that area. At the end of an exercise, the trainees can be unfrozen with a specialized baton.[3]

The rounds can be used in most UNSC firearms, including MA5 series assault rifles, M6 series sidearms, SRS99 series sniper rifles, as well as XBR55 battle rifles.[4][5] There are also TTR grenades[6] and claymores.[3]

A less advanced version of a tactical training round is used in the paint pellet gun.


Lieutenant Commander Jilan al-Cygni used two TTR shots to knock Governor Nils Thune unconscious and end his resistance to the evacuation plan for Harvest during the First Battle of Harvest.


List of appearances[edit]


  1. ^ Halo: Silent Storm, Chapter 5
  2. ^ Halo 4: Forward Unto Dawn
  3. ^ a b c Halo: Contact Harvest, pg. 215
  4. ^ Halo: Contact Harvest, pg. ??
  5. ^ Halo 4: Forward Unto Dawn Part I
  6. ^ Halo: Evolutions - Essential Tales of the Halo Universe, "Dirt", pg. 122