Johnny Manziel: Military Witness In Hit-and-Run ... 'Didn't Seem Drunk'

Johnny Manziel has a pretty solid witness in his hit-and-run accident -- a U.S. Army soldier who says the QB didn't do anything wrong when he was T-boned in Dallas last month.

TMZ Sports obtained the crash report filed with the Texas Dept. of Transportation which says Johnny was traveling with his old Texas A&M teammate, Jonathan Stewart, when they were hit by a black Dodge.

The report lists a witness ... so, we called him up -- and it turns out the guy is a 39-year-old Army reservist who says he has no personal relationship with Manziel ... he just happened to be driving near him that day.

The soldier essentially says Manziel has been telling the truth -- that he was hit by a person making a left turn ... and when Johnny pulled over to deal with the crash, the other car sped away.

We asked the question everyone's thinking -- did Johnny seem intoxicated?

The witness told us, "He didn't seem drunk. He seemed shaken up."

Cops opened up an investigation and were hunting for the other driver.

As for Johnny, the witness says he seemed okay -- though he did complain of leg pain -- but refused medical treatment and drove himself home.

Of course, Johnny left for a party trip to Mexico a short time later ... so, we're guessing no real damage.