AE       Architect and Engineering
CN       Construction
DR       Demolish, Dismantle or Replace
ER       Equipment Rental
HW       Hardware
IR       Inspect and Repair as Necessary
MD       Modification
OV       Overhaul
RD       Research and Development
RE       Repair
SB       Shipbuilding
SP       Supplies
SU       Subsistence
SV       Services
TE       Test and Evaluation
UT       Utilities