Yup.
However, the creation of Emerald Dawn was kind of tortured, so it was complicated story.
Until the end of the Steve Englehart/Joe Staton run, Andy Hefler was editor of GL. When DC wanted to try its first stab at weekly comics, Hefler lost the GL book so Hal could be one of the headliners of Action Comics Weekly, which was edited by Denny O'Neil.
Suffice it to say, O'Neil struggled to understand Hal, despite his long history writing him during the 70s. He couldn't quite wrap his head around what made Hal click. As a result, James Owlsey (later known as Christopher Priest) and Peter David made a variety of poorly considered decisions regarding GL, including killing off Katma Tui and revealing that Abin Sur had actually lobotomized Hal into being fearless.
When Action Comics Weekly failed, Andy Hefler regained control of the GL franchise and set to work on relaunching GL by establishing a new Post-Crisis origin for Hal Jordan. James Owlsey/Priest, who'd been writing the ACW GL stories, was set to write the story, but he and Hefler didn't jibe as creatively as he had with O'Neil, so Owlsey jumped ship after the first issue of Emerald Dawn.
Unfortunately, that first issue depicted Hal as getting into a car accident after a night at the bar with his friends. Priest says that the intention was never for Hal to have been drunk driving and that, had he remained as writer, he would have shown how Hal wasn't, in fact, drunk. However, when he left, that was never communicated to new writers Kieth Giffen & Gerard Jones, who felt the first issue portrayed Hal as an unlikable ******* and set to work trying to rehabilitate him by culminating the first Emerald Dawn with Hal surrendering himself to authorities for drunk driving and serving 90 days in prison.
Due to the success of Emerald Dawn, Hefler asked Giffen & Jones with original artist MD Bright to do Emerald Dawn II, which focused on Hal's training under Sinestro during his 90 days in prison. That's when the whole Vietnam War vet idea got introduced.
I now realize this was a very overlong answer to your question. I got carried away with all the useless GL trivia rattling around in that geek brain of mine