Evan Wright, author of "Generation Kill" mentions his notebook of choice in a recent post at the Penguin Blog.
From a reporting-standpoint all of this posed difficulties. My suit had only one small pocket. For all the deficiencies one encounters with the military, the shoulder pocket on Marine Corps-issue chemical protective suits is ingenious. It’s a small single pocket on the upper left sleeve, just below shoulder and tilted at the ideal angle for stowing things in it with your right hand. It was just large enough to hold a single Moleskine notebook.
A Moleskine notebook comes with an elastic band woven in the cover, which can be snapped around it to keep it from opening. When I first noticed this, I thought the elastic band was useless. I quickly learned you can slip a pen into the book–leaving it at whatever page you are on–and squeeze the book shut around it. This way you always have your pen when you grab your notebook. Since the notebook is so incredibly sturdy, you can crush it around the pen on a different page each time you use it, and it will not fall apart.
All of this might seem obsessive, or like some sort of lame attempt at product-placement for the makers of Moleskine (I have received no compensation from them; nor do I own stock in the company), but if you’re going into combat this becomes important.