A 20-year-old U.S. Army soldier, willing to put his life on the line for our country, is targeted in a vicious attack during a two week visit back home to Houston.

Luis Diaz was shot Sunday night around 11 p.m. in the 13700 block of South Post Oak Road.

Police said the violent attack appears to be result of a road rage confrontation.

Diaz is listed in critical condition with a gunshot wound to the head. According to police, the bullet became lodged behind his ear.

The key witness in the investigation is Diaz’s friend, who was in the passenger seat at the time of the shooing.

Investigators haven’t said what they information they gathered from that friend.

Police also aren’t saying if they’ve found any surveillance video relevant to the case.

The suspect was reportedly seen speeding away from the scene in a white boxy vehicle, possibly a Toyota Scion.

“Road rage, man! Everybody is bumper to bumper. Everybody is in a hurry. You say, 'Hey you!' The next thing you know, you might have a boom boom,” said Donald, a driver who didn’t want to use his last name. “This is crazy place out here. These streets are crazy.”

Drivers who saw the aftermath are saddened to learn of what happened to Diaz.

However, many are not surprised it came to this.

“Road rage is ridiculous, and this area is known for it,” said driver Reginald Fisher. “You see it at the red lights, and they chase each other down.”

A 2014 road rage survey by AutoVantage said Houston has the least courteous drivers in the country.

Another recent report by AAA said that nearly 80 percent of drivers expressed significant aggression or road rage behind the wheel at least once in the past year.

It suggest that nearly eight million U.S. drivers have engaged in extreme examples of road rage, including purposefully ramming another vehicle or getting out of the car to confront another driver.