Question: Type 07 military uniforms were first seen during the transfer of sovereignty from the United Kingdom to which country?

Context paragraphs:
Joint Declaration on the Question of Macau: The Joint Declaration on the Question of Macau, or Sino–Portuguese Joint Declaration, was a treaty between Portugal and the People's Republic of China over the status of Macau.  The full name of the treaty is Joint Declaration of the Government of the People's Republic of China and the Government of the Portuguese Republic on the question of Macao.  Signed in March, 1987 the Declaration established the process and conditions of the transfer of the territory from Portuguese rule to the People's Republic of China.  The Joint Declaration served also as the main source of fundamental rights that were implemented in the Macau Special Administrtaive Region Basic Law.  The process was similar to the transfer of Hong Kong to Chinese sovereignty by the United Kingdom in 1997.

Sino-British Joint Liaison Group: Sino-British Joint Liaison Group () or simply Joint Liaison Group was a meeting group formed in 1985 between the Governments of the United Kingdom of Great Britain and Northern Ireland and the People's Republic of China after signing of Sino–British Joint Declaration ("Joint Declaration" for short), a treaty for the transfer of sovereignty of Hong Kong from Britain to China.  It was set up for liaison, consultation and the exchange of information to implement the Joint Declaration and make the transfer of Hong Kong Government in 1997 smooth.

Type 97 Service Dress: Type 97 Service Dress was the military uniforms used by all branches of the People's Liberation Army (PLA) in both the People's Liberation Army Hong Kong Garrison and People's Liberation Army Macau Garrison in 1997 and 1999.  They are being replaced with the new Type 07 uniforms were unveiled in late June 2007 during the celebration ceremony the 10th anniversary of Transfer of sovereignty over Hong Kong.

Schacht v. United States: Schacht v. United States, 398 U.S. 58 (1970) was a United States Supreme Court case, which ruled that actors could wear accurate military uniforms—regardless of the production's portrayal of the military—on First Amendment grounds.

Canada under British rule: Canada first came under British rule with the Treaty of Paris (1763) which ceded New France, of which Canada was a part, to the British Empire.  Gradually, other territories, colonies, and provinces that were part of British North America would be added to Canada.  The Royal Proclamation of 1763 enlarged the colony of Canada under the name of the Province of Quebec, which with the Constitutional Act 1791 became known as The Canadas.  With the Act of Union 1840 Upper and Lower Canada were joined to become the United Province of Canada.  Later, with Confederation in 1867, the British maritime colonies of New Brunswick and Nova Scotia were joined with the British colony of Canada to form the Dominion of Canada, which was subsequently divided into four provinces, Ontario, Quebec, New Brunswick, and Nova Scotia.  A number of other British colonies, such as Newfoundland and British Columbia, and large territories such as Rupert's Land initially remained outside of the newly formed federation.  Over time, the remaining colonies and territories within British North America came under the control of Canada until the current geographic extent of the country was reached when Newfoundland and Labrador joined Canada in 1949.  Although confederation in 1867 led to an enlarged Dominion with increased autonomy over domestic affairs, Canada still remained a colony within the British Empire and was thus subordinate to the British Parliament until the enactment of the Statute of Westminster in 1931.  This statute recognized Canada as an independent peer coequal with the United Kingdom, and thus provided the Parliament of Canada with legislative sovereignty over all federal matters except the power to change the constitutional laws of Canada which remained under the purview of the Parliament of the United Kingdom.  Canada's final vestige of legal dependence on the United Kingdom was terminated in 1982 with the enactment of the Canada Act, subsequently providing Canada with full legal sovereignty completely independent of the United Kingdom.

Liberty cuffs: Liberty cuffs are a form of unauthorized personal decoration applied to the inside of the cuffs of military uniforms, which became popular in the United States Navy in the early 1900s and were imitated by other U.S. military branches starting around World War I. Liberty cuffs were embroidered patches sewn on the inside cuffs of sailors’ uniform shirts or jackets; the patches could only be seen when the cuffs were rolled up, which the sailor would do while on "liberty" or shore leave away from his ship.

Transfer of sovereignty over Hong Kong: The transfer of sovereignty over Hong Kong from the United Kingdom to China, referred to as "the Handover" internationally or "the Return" in China, took place on 1 July 1997.  The landmark event marked the end of British administration in Hong Kong, and is often regarded as the watershed of the British Empire.

PLZ-07: The PLZ-07 or Type 07 is a Chinese 122 mm self-propelled artillery made by the China North Industries Group Corporation (NORINCO).  The PLZ-07 self-propelled howitzer was first unveiled to the public during the military parade celebrating 60th anniversary of the PLA on 1 October 2009.  The PLZ-07 was developed to replace the older Type 89, Type 85 and Type 70/70-1 122 mm self-propelled artillery systems.  The PLZ07 122 mm tracked self-propelled gun mounts a 122 mm gun armed turret on the PLZ45 hull.  The vehicle weighs 22.5 tons fully loaded and carries 40 rounds of ammunition.  It is 6.66 m long, 3.28 m wide and 2.5 m high to the turret roof.  It carries a crew of five and its 440 kW diesel engine gives it a top road speed of 65 km/h and a maximum road range of 500 km.

Type 07: Type 07 () is a group of military uniforms used by all branches of the People's Liberation Army (PLA) of the People's Republic of China (PRC).  In 2007, the Type 07 uniforms replaced the Type 87 service uniforms used by regular units and the Type 97 Service Dress uniforms of the People's Liberation Army Hong Kong Garrison and the People's Liberation Army Macau Garrison.  The Type 07 uniforms were first seen in late June, 2007 during a celebration ceremony for the 10th anniversary of the Transfer of sovereignty over Hong Kong.

Roberts Ice Piedmont: Roberts Ice Piedmont ( ) is a large ice piedmont, 20 nautical miles (37 km) long in a north-south direction and 15 nautical miles (28 km) wide, lying to the north and northwest of Mount Calais and occupying most of the northeast corner of Alexander Island, Antarctica.  It was first seen from a distance and roughly surveyed by the French Antarctic Expedition, 1908–10, under Charcot.  It was photographed from the air by the British Graham Land Expedition (BGLE) on August 15, 1936, and roughly mapped from these photos.  It was then named by the United Kingdom Antarctic Place-Names Committee (UK-APC) in 1955 after Brian B. Roberts (1912–78), a British ornithologist, polar specialist and leading figure in the development of Antarctic nomenclature; ornithologist, BGLE, 1934–37; Secretary, United Kingdom Antarctic Place-names Committee, 1945-74.  About six nunataks are situated within the Roberts Ice Piedmont, these are Hengist Nunatak (a separate nunatak) and the Horsa Nunataks (a group of about five nunataks).  Both of these features are named after Saxon kings of England in the fifth century; however, they have no association or relation with Brian B. Roberts and the Roberts Ice Piedmont itself.

Supporting paragraphs: Type 07 Transfer of sovereignty over Hong Kong
Answer: China