There are numerous reasons that governments around the globe and all branches of the military are choosing COTS over military specification equipment, including:
The reliability of commercial grade components and subsystems has improved, eliminating the justification for expensive military specification equipment.
Military agencies can implement more flexible, high performance systems at a lower unit cost.
Agencies can take advantage of current commercial approaches and practices; this commonality simplifies the development and deployment of applications, which enables a more rapid incorporation of new capabilities.
Economies of scale make it feasible to use centralized depots in balance with critical on-site spares.
The higher the proportion of COTS equipment in a system, the easier and less expensive it becomes to modify or enhance the system, supporting more rapid technology refresh and greater adaptability to change.
COTS purchases dramatically reduce operations and support costs for military systems because suppliers are able to spread development costs over a number of market sectors.