(Cover) - EN Showbiz - Aaron Eckhart thinks he may have played his latest role too seriously.

The 42-year-old Hollywood star appears in new film, World Invasion: Battle LA, as a hardnosed Marine.

He will portray Sergeant Nantz in the movie, who is on the brink of retirement when an alien invasion scuppers his plans.

Aaron admits he relished the chance to play a Marine, fully immersing himself in the role. However, in retrospect, he can understand if those close to him thought that he took his preparation too far.

I remember doing my first costume fitting and putting on my uniform, I think I scared the costume designers. I took this role far too seriously. If I'm going to go out and make an alien movie, I'm going to do the best damn war alien movie I can do. I see no sense in going to do a movie for months in which I'm not pushing myself as an actor, I had to prove it to myself, and I had to prove it to the Marines, he told online magazine Cinemablend.

Despite these reservations, Aaron is reassured by the fact he feels he did the best job possible. The actor felt pressure to execute a performance that was associated with an alien invasion. He believed it was paramount that his enactment was as believable as possible, so not to insult the films intended audience.

That's the only way to do it. You're talking three weeks of intense boot camp training where you're around each other every day. By the time we even started filming the line was very blurry between whether we were actors or Marines. It has to be that way, because the audience is dealing with aliens, so they already know it's not real. They have to fight all of those preconceptions to get you to sit back and lose yourself. We have to be absolutely convincing so we make the job that much easier, he added. (C) Cover Media