I figure there a lot of you out there in that situation so here are some slam dunk, can't miss, easy to get, last minute gift ideas.  Run down to your local REI or bookstore and get;

• SPOT Satellite Messenger - the regular SPOT 2.  It is simple, reliable and should be a part of every outdoorsmans kit
• Surefire G2X Pro Flashlight - it is the best hand held torch on the market
• Marmot Precip Jacket - lightweight, technically correct, inexpensive protection from rain, snow and wind.  It is also available in all kinds of sizes and colors
• Victorinox Classic SD swiss army knife - I am sure he had one of these but the TSA probably took it away from him on his last business trip since it is such a menacing weapon.  Besides, you can never have too many of these
• a couple of new Nalgene bottles, 32 ouncer are most common
• a pair of Black Diamond Trekking poles (I like the Ultra Distance Z models myself)
• a dozen instant hand warmer packs to replace the expired ones he has
• Petzl Tikka Plus 2 headlamp - it is the best on the market in my opinion
• Victorinox Soldier folding knife
• or go to a book store and get a book called INSIDE SEAL TEAM SIX - MY LIFE AND MISSIONS WITH AMERICAS ELITE WARRIORS by Don Mann.  I have had the honor and pleasure of spending some time with Chief Warrant Officer Mann and he is a kick.  The book reads like you spent a few hours with him in a bar over a few pitchers
• or take the slacker route and just get him a $100 gift card so he can pick out whatever he needs slash wants