Dragon Season by Michael Casutt

When Air Force lieutenant Rick Walsh got back to Tucson after an eight month tour of Guam, he expected to be met at the airport by his girlfriend, Maia. Maia was beautiful and charismatic, with a mysterious past. Rick was looking forward to spending as much time as it took to discover everything about her.

Glory Road by Robert A. Heinlein

E. C. "Scar" Gordon was on the French Riviera recovering from a tour of combat in Southeast Asia , but he hadn't given up his habit of scanning the Personals in the newspaper. One ad in particular leapt out at him:

"ARE YOU A COWARD? This is not for you. We badly need a brave man. He must be 23 to 25 years old, in perfect health, at least six feet tall, weigh about 190 pounds, fluent English, with some French, proficient in all weapons, some knowledge of engineering and mathematics essential, willing to travel, no family or emotional ties, indomitably courageous and handsome of face and figure.

The Dragonriders of Pern by Anne McCaffrey and Todd McCaffrey

Humans and their flying dragon companions live in fear of thread, a caustic, deadly material that falls sporadically from space. But when the thread doesn't fall for a long time, people become complacent, forgetting that it is the brave dragonriders who can save them from the periodic threat. But when the thread falls, human and dragon heroes must fight the scourge.

Floating Dragon by Peter Straub

The quiet suburban town of Hampstead is threatened by two horrors.
One is natural.
The hideous unstoppable creation of man's power gone mad.
The other is not natural at all. And it makes the first look like child's play...

Dragon Masters by Jack Vance

Men have been at war for centuries with the reptilian race called "Basics." As conquerors always have, the winners of each bloody encounter have made slaves of the losers-but in this far-future war, each side has improved upon its slaves with genetic engineering.

The Pit Dragon Chronicles by Jane Yolen

Dragons are trained to fight to the death, and two determined teens help free them in this spellbinding saga. Training a dragon to be a fighting champion is the only way to freedom for fifteen-year-old Jakkin.

Roadmarks by Roger Zelazny

The Road runs from the unimaginable past to the far future, and those who travel it have access to the turnoffs leading to all times and places--even to the alternate time-streams of histories that never happened. Why the Dragons of Bel'kwinith made the Road--or who they are--no one knows. But the Road has always been there and for those who know how to find it, it always will be!