Open Software Foundation开放软件基金会 Office of Space Flight办公室的太空飞行 Open Software Foudation开放软件基金 Organizational Structure Facility组织结构的设施 Oil Stabilization Fund石油安定基金 Obtain Service From得到的服务 Open Systems Foundation开放系统的基础 Operational Support Facility操作支持设施 Oxidation-induced Stacking Fault氧化感生堆垛层错 Other Structures and Facilities其它结构和设施 Ordnance Storage Facility军械存储设备过程中丢失 Operations Support Flight运营支持飞行 Offset Field偏置场 Occupiable Square FeetOccupiable平方英尺 Office of Strategic Finance办公室的战略性融资