These are the companies for whom OST has provided proposal services:

Cortechs, Inc. - A Virginia-based information technology services and solutions company

Day & Zimmermann - Collectively, Day & Zimmermann's businesses provide deep vertical knowledge and experience in a number of areas to help accelerate customer success by creating a tomorrow that is safer, more secure, more innovative and more productive.

Delphinus Engineering, Inc. - A leading provider of expert services in the following core competencies: Information Technology, Marine Engineering, Marine Services, Facilities Operations & Maintenance and Business Management.

DynCorp International, Inc. - DynCorp International is a multifaceted, global enterprise that provides innovative solutions to the diverse technology and professional services needs of government and commercial industry worldwide.

EDS, Inc. - EDS provides a broad portfolio of business and technology solutions to help its clients worldwide improve their business performance.

Lockheed Martin Corporation - As a lead systems integrator and information technology company, the majority of Lockheed Martin's business is with the U.S. Department of Defense and the U.S. federal government agencies.

Northrop Grumman Corporation - Northrop Grumman Corporation is a $30 billion global defense and technology company whose 122,000 employees provide innovative systems, products, and solutions in information and services, electronics, aerospace and shipbuilding to government and commercial customers worldwide.

Oberthur Card Systems - One of the world's leading providers of card-based solutions, software and applications including SIM and multi-application smart cards.

Perot Systems - Perot Systems delivers technology-based business solutions to help organizations worldwide control costs and cultivate growth

QTC Management, Inc. - The largest private provider of government-outsourced occupational health, and injury and disability examination services in the nation.

Raytheon Company - A Fortune 500 technology leader specializing in defense, aerospace systems, homeland security, and other government markets throughout the world.

Smisson-Cartledge Biomedical - An innovator in clinically superior and economically beneficial therapeutic solutions for the treatment of thermal infusion care.

STG , Inc. - Leading government contractor providing enterprise and IT infrastructure support, security support, applied engineering, and scientific and professional services support

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