It has two abuses atm:
  1. It stacks with itself making your soldiers almost immune to any damage for one turn. If you bring multiple Technicians to a mission you can make your party immune to damage for the whole combat. How? because of 2.
  2. It costs 0 AP and it allows you to use it and then use Recover right after and you get all your WP back. With two technicians in your party you can keep both somewhere and keep doing this every turn and have all your characters get "free" +40 to armor on all their body parts making them immune to most enemy weapons.