John Birmingham has a great trilogy out called The Axis of Time. It's a time travel/alternate reality series based around World War II. I'm on the last book, and it's excellent. Good characterizations and logical follow through on events. I highly recommend it. It starts with Designated Targets.

Have you read any Eric Flint? He does a lot of writing with Weber. I loved 1632, but then the series went downhill for me. I still re-read the first one, though! If you haven't already, you might look him up and see what you think of his writings, too. He works with partners a lot, so his series each have different feels. Some are more militaristic, some more fantastic, some more humorous, etc.  

There is also Elizabeth Moon's Heris Serrano series, which segues into the Esmay Suiza series.

  Ender's Game by Orson Scott Card.

  David Drake's Hammer's Slammers.

Harry Turtledove, does great military sci-fi, lots of it is alternative history, e.g. What if the South won the Civil War?  He has a lot out there too.

Ahem, yes Heinlien's Starship Troopers, which I have a nice copy of on my shelf- nudge, nudge, wink, wink!

Cheers, Margaret

I advise trying a lot of SM Stirling. Terminator Triology, Island on  the Sea of Time Trilogy and another trilogy I cant remember the name of but first book is Marching Through Georgia.

 Starfist is a military series with scifi settings.

 A good bit of Eric Flint's stuff is Military Scifi too.

 I think it was mentioned but Jerry Pournelle's Falkenberg Legion series is good.

 H. Beam Pipers Lord Kalvan of Otherswhere, Space Viking and The Cosmic Computer are classics.

There is more but thats what I can think of off the cuff. 

Someone mentioned the harry Turtledove series, they are good, and I have four on my shelf, ;-)!

I would like to suggest Mike Moscoe's First Down http://www.paperbackswap.com/book/browse_advanced.php?a_type=e&l=25&sby=title&oby=ASC&a=Mike+Moscoe

If my memory serves me he was in the military himself, I haven't read anything but the First Down seriers, but I decided to place an order for the other books I find on tis site.

I was reading Tanya Huff's Valor books (I forget the exact titles; there are two of them, and they have 'Valor' n the title), and was very impressed -- ground-level grunt's-eye-view stuff The viewpoint character is a sergeant, and anyone who's been in the military at all knows that they really run the show. :->

 Also, Elizabeth Bear's Jenny Casey trilogy (first book: Hammered), while not about an active military action, have an ex-mil protagonist with a lot of flashbacks.

Naomi Novik's Temeraire books (first book either 'Temeraire' or 'His Majesty's Dragon', depending on whether it was a british or american edition) are alternate-world Napoleonic. If you like Horatio Hornblower (and you've read Weber!), and are willing to suspend your disbelief far enough to wonder what it'd be like with dragons as fighting animals/airships/allies, give her a try.
 

Lois McMaster Bujold's Vorkosigan series is partially military SF (mostly special ops, and sometimes pretty peculiar special ops). But very good!

And if you're interested in military fantasy at all, try Glen Cook's Black Company series (pretty dark but also good).

I love the Tanya Huff books - which, BTW, are very funny - and there is a third coming out soon. The first two are available either separately or as a two-in-one volume that came out recently (and that I nearly bought before realizing what it was).

For a great read in a series of Military Sci-Fi try David Feintuch's Hope series... starting with "Midshipman's Hope." These books are well written, and follows the career of interstellar naval officer Nick Seafort. He's an inexperienced midshipman unexpectedly thrust into a position of command, where the fate of an entire spaceship of colonists rests in his hands. The severely tight restraint of military law bounds them all to a point of terror of breaking the rules... just as much as the terrible space monsters they must defeat... or die trying.

The link to find these books is here: 

http://www.amazon.com/s/ref=nb_ss_gw/102-3812146-2532169?url=search-alias%3Dstripbooks&field-keywords=David+Feintuch

Linda

All of you have to go out and get ORPHANAGE and ORPHAN'S DESTINY by ROBERT BUETNER!!!

I am not even kidding ya'll. The narritive is in the first person by a cocky soldier by the name of Wander. His life gets thrown all over the place and you learn to really love this guy. He can be hilarious at times. . .and you really start to care about him. You will cringe when he's in a tight situation (more than once) and you will cheer at his sucess. . .you may also. . .shed a tear *tear* when he loses those close to him *sniff sniff*

This pair of books was a very fast pased military sci fi thriller about an alien war. If you liked STARSHIP TROOPERS then you will really enjoy this book. It might seem like a knock off. . .but it really isn't.

Read it and love it. . .I guarentee you will not be able to put them down and you will have read them in one day!

I will love to hear what ya'll have to say about this book if/when you read it. Keep me in mind and send me a message if you liked it. I KNOW YOU WILL!

Rick Shelley has a series out that is fantastic when in comes to military.  Blieve it or not they are named Officer-Cadet, Lieutenant,Major,lieutenant Colonel, Colonel

Great reading.

If you want something a litte more offbeat I would definately recommend The Ender Wiggen series by Orson Scott Card. The first three are Ender's Game, Speaker for the Dead and Shadow of the Hegemony.

Actually, the first three Ender books are Ender's Game, Speaker for the Dead, and Xenocide. Shadow of the Hegemon is the first book of the second trilogy.

They're very good, though. :-> Ender's Game is really the only one of them that's military; it's set at an elite academy to train staff officers/strategic thinkers from early childhood.

Armor  by: John Steakley

This was a good one.

Let me add a voice for David Drake.  He's probably the best military SF author around.  Try any of the Hammer's Slammers books or some of his short stories, The Military Dimension or Grimmer Than Hell.  You really can't go wrong with any of his stuff.

There Will Be War by Jerry Pournelle & John F. Carr an anthology, 9 books in the series....

the first 40-50 of James Axler's Deathlands series...

Horseclans Series by Robert Adams...

http://www.scifan.com/ is a great site to search on... you can pick a topic, such as post apocalypse... get a list of books you want, then come back here!!!