PLA has 'security blackout' at historic military sites
Antiquities expert says army holding back information on 58 structures, even though much of it is public knowledge

Dozens of historic military structures controlled by the PLA remain ungraded for heritage value despite a four-year exercise, and the military has been withholding information due to "security concerns", a government antiquities expert says.
The PLA declined to say whether it would release the information - such as photos and maps - which is available in published literature on colonial military history.
The army sites were among 1,444 historic places listed in 2009 for heritage appraisal, the Antiquities and Monuments Office said on its website.
Now the Antiquities Advisory Board is close to finishing its grading work, with chairman Bernard Chan due to hold his last meeting on December 17.
But work remains outstanding on the military installations, along with 129 private buildings.
The office said it had not yet graded the PLA sites only because it was handling the 1,444 places batch by batch. It said the military did not object to the grading, but said: "Due to security concerns, it is not appropriate to release details of the PLA sites."