Realistic and immersive simulations of land, sea, and sky are requisite to the military use of visual simulation for mission planning. Until recently, the simulation of natural environments has been limited first of all by the pixel resolution of visual displays. Visual simulation of those natural environments has also been limited by the scarcity of detailed and accurate physical descriptions of them. Our aim has been to change all that. To this end, many of us have labored in adjacent fields of psych- ogy, engineering, human factors, and computer science. Our efforts in these areas were occasioned by a single question: how distantly can fast-jet pilots discern the aspect angle of an opposing aircraft, in visual simulation? This question needs some ela- ration: it concerns fast jets, because those simulations involve the representation of high speeds over wide swaths of landscape. It concerns pilots, since they begin their careers with above-average acuity of vision, as a population. And it concerns aspect angle, which is as much as to say that the three-dimensional orientation of an opposing aircraft relative to one’s own, as revealed by motion and solid form. v vi Preface The single question is by no means simple. It demands a criterion for eye-limiting resolution in simulation. That notion is a central one to our study, though much abused in general discussion. The question at hand, as it was posed in the 1990s, has been accompanied by others.

This book examines the human factors issues associated with the development, testing, and implementation of helmet-mounted display technology in the 21st Century Land Warrior System. Because the framework of analysis is soldier performance with the system in the full range of environments and missions, the book discusses both the military context and the characteristics of the infantry soldiers who will use the system. The major issues covered include the positive and negative effects of such a display on the local and global situation awareness of the individual soldier, an analysis of the visual and psychomotor factors associated with each design feature, design considerations for auditory displays, and physical sources of stress and the implications of the display for affecting the soldier's workload. The book proposes an innovative approach to research and testing based on a three-stage strategy that begins in the laboratory, moves to controlled field studies, and culminates in operational testing.

Emily's dad is accused of killing a teenage girl. She's sure he's innocent, and is determined to discover the truth of what happened. But her journey leads her to discover that dangerous games are being played in the woods at night ...

"DIVIDED WE FALL delivers cover-to-cover action, intrigue and suspense, all with a gut-punch of an ending that'll leave you begging for the next installment." -- Brad Thor, author of THE LAST PATRIOT Danny Wright never thought he'd be the man to bring down the United States of America. In fact, he enlisted in the Idaho National Guard because he wanted to serve his country the way his father did. When the Guard is called up on the governor's orders to police a protest in Boise, it seems like a routine crowd-control mission ... but then Danny's gun misfires, spooking the other soldiers and the already fractious crowd, and by the time the smoke clears, twelve people are dead. The president wants the soldiers arrested. The governor swears to protect them. And as tensions build on both sides, the conflict slowly escalates toward the unthinkable: a second American civil war.With political questions that are popular in American culture yet rare in YA fiction, and a provocative plot that asks what happens when the states are no longer united, Divided We FAll is Trent Reedy's very timely YA debut.