The fighter aircraft unit of 601 KJ, known as "Squadron 601", was based at Mwanza Air Base (MiG-21s) and Ngerengere Air Force Base (F-5s, F-6s). In 1978 the Air Defence Command employed approximately 1,000 personnel. The current Commander of the now-Tanzania Air Force Command is Major General William Ingram, who replaced Major General Joseph Kapwani upon the latter's retirement in January 2016. During a visit to Zimbabwe in March 2014, Kapwani commended Zimbabweans for 'remaining resolute and firmly safeguarding the country's sovereignty despite the suffering brought on by illegal Western sanctions.' He made the remarks when he paid a courtesy call on Air Force of Zimbabwe Commander Air Marshal Perrance Shiri at AFZ headquarters in Harare on 12 March 2014. General Kapwani, who was then the chair of the SADC Standing Aviation Committee, said he was in Zimbabwe to share experiences and strengthen relations. A few of the Tanzanian air wing's transport remain serviceable. However, its Shenyang F-5s, and Chengdu F-7s are reported to fly only on rare occasions because of airworthiness problems. Tanzania's long coastline means that transports are also used for patrol flights. On 14 November 2013, Helmoed-Römer Heitman reported for Jane's Defence Weekly that a 'usually reliable source' had informed Jane's that the TPDF had replaced its 12 old CAC J-7 fighters with 14 new J-7s, twelve single-seat and two dual-seat. Deliveries were completed in 2011. Heitman also reported that the aircraft were fully operational at Dar es Salaam and Mwanza air bases. Recent estimates (2014) suggest that Tanzania's air force command operates 32 aircraft in 3 different types. It is believed they are operating 14 fighters, 11 fixed-wing attack aircraft and 7 transport aircraft. On October 1, 2015 a K-8 trainer jet of Tanzania Air Force Command crashed into the sea killing both pilots. Naval Command The navy operates 9 fast attack craft and 12 patrol boats. The current Commander of the Naval Command is Rear Admiral Ramson Godwin Mwaisaka. The closing ceremony of the joint Tanzanian-Chinese exercise Beyond/Transcend 2014 was held on November 14, 2014, at Kigamboni Naval Base attended by guests that included China’s ambassador to Tanzania, the Chief of the TPDF, and the heads of the navy and air force. The exercise between the Chinese People’s Liberation Army Navy and the TPDF began on October 16 in Dar es Salaam, with more than 100 navy officers and seamen participating. Jane's Defence Weekly wrote