It's no Allied Assault, but you can't argue with free.
EA has made Medal of Honor: Pacific Assault available for free on Origin. This is part of the company's On the House promotion, which offers a free game from EA's back catalogue every four or so weeks.
We don't know when another game will replace Pacific Assault, but you should probably have at least a month.
Just head over to your Origin client, or this link to add it to your cart.