The program was expanded to workers living in Beijing after authorities discovered a new outbreak in the capital.
It was not clear how widely the potential vaccine will be used within China's enormous military establishment.
The Phase 1 and Phase 2 clinical trials showed the vaccine candidate has potential to prevent diseases caused by the coronavirus, which has killed half a million people globally, but its commercial success can not be guaranteed, the company said. The formula was developed by a combined military research unit and the biotech firm, the company said Monday.
Swaminathan said, "at the moment, we do not have a proven vaccine but if we are lucky, there will be one or two successful candidates before the end of this year".More news: Couple point guns at protesters in St Louis outside their mansion
The first order, regardless of the final results of the vaccine clinical trials, will cost Brazil US$127 million, Franco said.
According to medical journal The Lancet there have already been more than 1,000 clinical trials on dozens of pharmaceutical treatments for the virus but no effective medical intervention has yet been found.
Ad5-nCoV is one of China's eight vaccine candidates approved for human trials in China and overseas, and it has also been approved for testing in Canada.
CanSino revealed it had received a certificate from China's National Medical Products Administration to launch clinical trials.More news: Microsoft will close nearly all of its retail stores
"The Ad5-nCoV is now limited to military use only and its use can not be expanded to a broader vaccination range without the approval of the Logistics Support Department", CanSino said, referring to the Central Military Commission department which approved the military use of the vaccine.
More than half of 17 candidate vaccines identified by the World Health Organization (WHO) that are in clinical evaluation involve Chinese companies or institutes.
Chris Smith started writing about gadgets as a hobby, and before he knew it he was sharing his views on tech stuff with readers around the world.More news: Louis couple points guns at protesters near mayor's home