No Prateek, The command subjunctive or the present subjunctive is neither used for possibilities nor hypotheticals. Can you please give some examples?
There are subjunctive mood uses in the present tense and the past tense. In the present subjunctive, the verb is always in the bare infinitive, even if the subject is plural and the tense is past or future. In the case of the present subjunctive mood, those sentences in which one would use such verbs as "is, are, was, were or will be" , should use the bare infinitive verb - be -. The subjunctive mood is used when the verb indicates a desire, intention, command, recommendation, request, resolution, or advice. It is also used along with such words as advisable, better, desirable, and directive, essential, fitting, imperative, important, necessary, urge, urgent and vital.
I am afraid you are probably confusing the issue with past subjunctives, which deal with hypotheticals or impossibles. However, in past subjunctives, you do not have the 'that' plus the bare infinitive verb structure.