units. The Government of Hong Kong and Government of Macao has established Hong Kong Economic and Trade Offices (HKETOs) and Delegação Económica e Comercial de Macaus (DECM), in some countries as well as Greater China Region. HKETOs serve as a quasi-interests section in favour of Hong Kong. DECMs serve as a quasi-interests section in favour of Macao. For regions with no HKETOs and DECM, Chinese diplomatic missions take charge of protecting Hong Kong-related and Macau-related interests. Some countries which have a diplomatic relationship with the central Chinese government maintain Consulate-General offices in Hong Kong and Macau. Olympic Games In sporting events such as the Olympic Games or Asian Games, the SARs may have their own independent teams. They participate under the respective names of "Hong Kong, China" and "Macau, China", and compete as different entities as they had done since they were under foreign rules, but both SARs are usually allowed to omit the term ", China" for informal use. Defence and military The People's Liberation Army is garrisoned in both SARs. PRC authorities have said the PLA will not be allowed to interfere with the local affairs of Hong Kong and Macau, and must abide by its laws. In 1988, scholar Chen Fang of the Academy of Military Science even tried to propose the "One military, two systems" concept to separate the defence function and public functions in the army. The PLA does not participate in the governance of the SAR but the SAR may request them for civil-military participation, in times of emergency such as natural disasters. Defence is the responsibility of the PRC government. A 1996 draft PRC law banned People's Liberation Army–run businesses in Hong Kong, but loopholes allow them to operate while the profits are ploughed back into the military. There are many PLA-run corporations in Hong Kong. The PLA also have sizeable land holdings in Hong Kong worth billions of dollars. Immigration and nationality Each of the SARs issues passports on its own to its permanent residents who are concurrently Chinese (PRC) citizens. PRC citizens must also satisfy one of the following conditions: born in the SAR; born anywhere while either parent was a permanent resident of the SAR; resided continuously and legally for seven or more years in the SAR and therefore gained a right of abode in the SAR. Apart from affording the holder consular protection by the Ministry of Foreign Affairs