What Does RE Factor Mean?

We have a lot of people asking us what RE Factor stands for so we thought we would give a good explanation. RE stands for Relative Effectiveness as it pertains to TNT. What this means is that when people with really big brains who didn’t get a lot of dates in college sat down and tried to figure out how to classify the effectiveness of explosives they made TNT the base explosive.

When an explosive is described, it is outlined in how much of that explosive would be required to complete the same job as TNT. For all intents and purposes, TNT has an RE Factor of 1. While there are a lot of different variables that go into the effectiveness of an explosive, it is thought that an explosive that has a higher RE Factor than another would require less explosives than TNT to complete the same job. If an explosive has an RE Factor less than one, it will take more of that explosive to complete the same job as TNT.

While this is not entirely accurate since explosives propagate at different speeds and are better for specific jobs such as steel cutting or quarry ditching, it is the best method for measuring an explosives effectiveness.

Below is a list of explosives by effectiveness

  • Ammonium nitrate (AN)- 0.42
  • Black powder (75% KNO3 + 15% C + 10% S)- 0.55
  • ANFO (94.3% AN + 5.7% fuel oil)- 0.80
  • Acetone Peroxide (TATP)- 0.83 TNT- 1.00
  • Amatol (80% TNT + 20% AN)- 1.17
  • Tetrytol (70% Tetryl + 30% TNT)- 1.20
  • Tetryl- 1.25 C-4 (91% RDX)- 1.34 C-3 (old RDX based)- 1.35
  • Composition B (63% RDX + 36% TNT)- 1.35
  • Nitroglycerin- 1.50
  • Erythritol tetranitrate- 1.60
  • RDX- 1.60 Semtex (94.3% PETN + 5.7% RDX)- 1.66 PETN- 1.66 HMX- 1.70

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How To Call in a 9 Line MEDEVAC

Step 1: Conduct care under fire and TCCC

Step 2: Determine the number of patients by type

Step 3: Contact MEDEVAC channel

Step 4: Using 9 Line MEDEVAC format call-in MEDEVAC.



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The first 5 lines are most important when calling in a MEDEVAC, the other 4 can be relayed when birds are in the air. Ensure you have a safe LZ for the landing party.

How To Call In A 9Line MEDEVAC And MIST Report

Example of 9 Line MEDEVAC: “Bravo five this is Victor two, request 9 line MEDEVAC” “Victor two this is Bravo five prepared to copy” “Line one, one eight sierra whisky papa one two tree one four five one seven” “Line two, two seven zero zero Bravo Five” “Line tree, alpha one, bravo tree” “line four, alpha” “line five, alpha four” “How copy over?” At this point, the MEDEVAC line will repeat all given and initiate a movement for MEDEVAC.


Once in the air, the operator will relay the final four lines in the same manner given. It’s always important to remain calm on the radio and ALWAYS have a 9 Line MEDEVAC on hand.