The Army Act,1950
Section 78. Retention in the ranks of a person convicted on active service
When., on active service, any enrolled person has been sen- tenced by a court- martial to dismissal, or to transportation or im- prisonment whether combined with dismissal or not, the prescribed officer may direct that such person may be retained to serve in the ranks, and such service shall be reckoned as part of his term of transportation or imprisonment, if any.