The United States has two of the longest unfortified borders in the world . . . and people arrive daily by air from outside the country, too. At those borders and airports are the border security officers who are on the front lines of making sure our nation is protected. They use their training, skill, and the latest technology to keep the bad guys out. Inside, learn how they keep our borders safe, every day, around the clock. Adventure, courage, talent . . . and servicethey can all be found in the stories of brave men and women who go . . . ON A MISSION. Each title in this series contains color photos, close ups of key tools and technology used on each mission, and back matter including: an index, further reading lists for books and internet resources, and a series glossary. Mason Crests editorial team has placed Key Icons to Look for throughout the books in this series in an effort to encourage library readers to build knowledge, gain awareness, explore possibilities and expand their viewpoints through our content rich non-fiction books. Key Icons are as follows: Words to Understand are shown at the front of each chapter with definitions. These words are then used in the prose throughout that chapter, and are emboldened, so that the reader is able to reference back to the definitions- building their vocabulary and enhancing their reading comprehension. Sidebars are highlighted graphics with content rich material within that allows readers to build knowledge and broaden their perspectives by weaving together additional information to provide realistic and holistic perspectives. Text Dependent Questions are placed at the end of each chapter. They challenge the readers comprehension of the chapter they have just read, while sending the reader back to the text for more careful attention to the evidence presented there
