The World Turned Upside Down by David Drake, Eric Flint, Jim Baen

Barracks of the North American Continental Thruway Patrol. There was the feel of snow in the air but the thermometer hovered just at the freezing mark and the clouds could turn either into icy rain or snow.
    Patrol Sergeant Ben Martin stepped out of the door of the barracks and shivered as a blast of wind hit him. He pulled up the zipper on his loose blue uniform coveralls and paused to gauge the storm clouds building up to the west.
    The broad planes of his sunburned face turned into the driving cold wind for a moment and then he looked back down at the weather report secured to the top of a stack of papers on his clipboard.
    Behind him, the door of the barracks was shouldered open by his junior partner, Patrol Trooper Clay Ferguson. The young, tall Canadian officer's arms were loaded with paper sacks and his patrol work helmet dangled by its strap from the crook of his arm.
    Clay turned and moved from the doorway into the wind. A sudden gust swept around the corner of the building and a small sack perched atop one of the larger bags in his arms blew to the ground and began tumbling towards the drill field.
    "Ben," he yelled, "grab the bag."
    The sergeant lunged as the sack bounded by and made the retrieve. He walked back to Ferguson and eyed the load of bags in the blond-haired officer's arms.
    "Just what is all this?" he inquired.
    "Groceries," the youngster grinned. "Or to be more exact, little gourmet items for our moments of gracious living."
    Ferguson turned into the walk leading to the motor pool and Martin swung into step beside him. "Want me to carry some of that junk?"
    "Junk," Clay cried indignantly. "You keep your grimy paws off these delicacies, peasant. You'll get yours in due time and perhaps it will help Kelly and me to make a more polished product of you instead of the clodlike cop you are today."
    Martin chuckled. This patrol would mark the start of the second year that he, Clay Ferguson and Medical-Surgical Officer Kelly Lightfoot had been teamed together. After twenty-two patrols, cooped up in a semiarmored vehicle with a man for ten days at a time, you got to know him pretty well. And you either liked him or you hated his guts.
    As senior officer, Martin had the right to reject or keep his partner after their first eleven-month duty tour. Martin had elected to retain the lanky Canadian. As soon as they had pulled into New York Barracks at the end of their last patrol, he had made his decisions. After eleven months and twenty-two patrols on the Continental Thruways, each team had a thirty-day furlough coming.
    Martin and Ferguson had headed for the city the minute they put their signatures on the last of the stack of reports needed at the end of a tour. Then, for five days and nights, they tied one on. MSO Kelly Lightfoot had made a beeline for a Columbia Medical School seminar on tissue regeneration. On the sixth day, Clay staggered out of bed, swigged down a handful of antireaction pills, showered, shaved and dressed and then waved good-by. Twenty minutes later he was aboard a jet, heading for his parents' home in Edmonton, Alberta. Martin soloed around the city for another week, then rented a car and raced up to his sister's home in Burlington, Vermont, to play Uncle Bountiful to Carol's three kids and to lap up as much as possible of his sister's real cooking.
    While the troopers and their med officer relaxed, a service crew moved their car down to the Philadelphia motor pool for a full overhaul and refitting for the next torturous eleven-month tour of duty.
    The two patrol troopers had reported into the Philadelphia Barracks five days ago—Martin several pounds heavier courtesy of his sister's cooking; Ferguson several pounds lighter courtesy of three assorted, starry-eyed, uniform-struck Alberta maidens.
    They turned into the gate of the motor pool and nodded to the sentry at the gate. To their left, the vast shop buildings echoed to the sound of body-banging equipment and roaring jet engines. The