It was standard in the UH1 back when, and standard for landing at scenes when flying EMS. The degree of urgency varies, as does the aggressiveness of the maneuver, but it's essentially the same. In EMS nobody is likely to shoot at you, and there isn't a huge hurry to get down, but the overhead approach satisfies the requirements. I need to see the scene, check for obstacles, the wind, and where the ambulance is. I can see all that somewhere in the circle, usually all through it, and the object is to end up at the optimum approach direction and angle, considering all the above. It's certainly not an aggressive maneuver, and not done too close to the LZ, and the speed is kept relatively slow. I like ~60 kts, almost never below that until on final. The rate of descent is whatever it takes to get on final at about 300' AGL, and I tend to keep that rate of descent until I get near where there could possibly be wires. I don't mind a 300 fps descent at 300'AGL in flat terrain, but when I get near 200' I slow to a very slow rate, because there is always a high probability of wires down lower, and I want a chance to stop the approach immediately if necessary. But that's not the same in a tactical military situation. You worry about what is most likely to hurt you. Rapid descents, in close, with a hard flare at the bottom, is less likely to hurt you than ordnance flying through the chariot. The maneuver is similar, but not completely identical.