NOTAR: In light of the apparent fragility of our helicopter fleet, why isn't the army re-examining such vulnerability reducing features such as NOTAR? NOTAR, for the normal people who don't collect acronyms and reductions as a hobby, stands for NO TAil Rotor. You can see what the MD520N, a civilian chopper, looks like with the NOTAR system here. A nice & simple explanation of NOTAR's benefits lives here.