Stress is laid in the counter affidavit on the fact that simultaneously with the constitution of the ARC as a regular department, the ARC (Technical) Service Rules, 1976 were promulgated by the Government and it has been submitted that the principles laid down in the aforesaid Memorandum did not get attracted to the new service inasmuch as it is clearly specified in the Memo itself that the principles enunciated therein will not be applicable for such Services and posts for which separate principles have been already issued or may be issued thereafter by the Government, The allegation of the petitioners that they had not been considered for promotion at the time when the vacancies in the categories of DFOs were filled up during the year 1968 to 1975 has been denied by the first respondent and it is averred in the counter affidavit that the direct recruits were given promotions in the higher posts when they were found suitable by the DPC for ad hoc promotions to the grades of FOs (Tech.), etc.