Cable 1971, otherwise known as Priority Signal or File 1971 was a high profile and secret military signal communicated in December 1952 between the two main inter-services branches of Pakistan–the Pakistan Army and the Pakistan Navy.^[1]: 219 It is notable for the fact that it essentially predicted the separation of Pakistan and Bangladesh and by coincidence its title contained the year in which the separation actually happened, almost 20 years later.

The cable discussed the implication of One Unit and one culture policy, religious fanaticism, and the economic parity between the West and East Pakistan that will ultimately result in the division of Pakistan into two different groups.^{[1]: 219–220}

The cable's message read as:

• The creation of Committee of Ulema to veto the decisions taken in the House of People on religious matters, gives excess of powers to Ulema over the rights of elected representatives of the people. This gives an impression of Pakistan as being a theocratic state.^{[1]: 219–220}
• To recommend that the head of the state should be a Muslim will unnecessarily create suspicions in minds of the minorities in Pakistan. The choice to select the head of the state should be left entirely to the people, to select without prejudice to caste, colour and creed.^{[1]: 219–220}
• It is maintained by same officers that a single House elected on population basis should have been envisaged, and we should cease to think in terms of Bengalis, Pathans, Balochis, Sindhis, Punjabis etc. The parity between West & East Pakistan will ultimately result in the division of Pakistan into two different groups, therefore, it is the very negation of one people, one country and one culture.^{[1]: 219–220}

The cable is notable for its highlighted title and many historians found strange that the cable was coincidentally numbered: Cable/File 1971.^[1]: 210