Standards Development Organization
Service Data Objects
Solar Dynamics Observatory
Staff Duty Officer
Squadron Duty Officer
Standards Developing Organization
Service Data Object
Scattered Disk Object
Solenoid Driver Output
Special Duty Only
Supervisory Detention Officer
Air Santo Domingo
Scheduled Day Off
School Duty Officer
Securities Division order
Semantic Data Object
serial data out
Server Data Objects
Servicing District Office
shielded diatomic orbital
Shielded Diatomic Orbitals
Shift Duty Officer
Social Dominance Orientation
Software Delivery Optimization
Solar Dynamic Observatory
Solutions Delivery Organization
Spatial Data Option
Spatial Database Option
Squadron Dispatch Officer
Staff Development Officer