DTIC has identified 25 broad subject fields and 251 groups to categorize t areas of scientific and technical interest.
dtic_subject_categories(snake_names = F)tibble
These fields and groups provide the structure for the subject grouping of technical reports in DTIC's collection and are used to define the areas of need-to-know in distributing these reports.
Through this site, you will find the subject coverage for each subject category as well as cross-references to related fields and groups.
if (FALSE) {
dtic_subject_categories()
}