After graduation, Sheikh Jassim was commissioned as
second lieutenant in the
Qatar Armed Forces on 9 August 1996. He was then appointed
heir apparent of Qatar on 23 October 1996, replacing his older half-brother
Mishaal bin Hamad Al Thani. Jassim later renounced his rights to succession in favour of his younger brother,
Sheikh Tamim, on 5 August 2003. According to state-run
Qatar News Agency, Jassim sent a letter to his father saying, "The time is appropriate to step down and prepare for a successor". He added in the same document, "I did not want, as I have told you from the start, to be appointed as crown prince", and noted he had only accepted the position due to "sensitive circumstances". Jassim was a personal representative of the former emir, and has been Honorary President of the Qatar National Cancer Society (QNCS) since 1997. Furthermore, he has been chair of the High Committee for Coordination and Follow-up since 1999, and Chairperson of the Supreme Council for the Environment and Natural Resources since 2000. He is also a patron of
Aspire Academy since 2003, and on the Board of Trustees of
Qatar Foundation. ==Attempted acquisition of Manchester United==