As you want to get the eligibility criteria for IPS exam for government employee so here is the information of the same for you:

Persons already in Government Service, whether in a permanent or temporary capacity or as work charged employees other than casual or daily rated employees or those serving under the Public Enterprises are however, required to submit an undertaking that they have informed in writing their Head of Office/Department that they have applied for the Examination.

Candidates should note that in case a communication is received from their employer by the Commission withholding permission to the candidates applying for/appearing at the examination, their application will be liable to be rejected/candidature will be liable to be cancelled.

As such there is no benefit is given for only government employee its there for military services.