What (a) investigations and/or oversight visits were conducted by the Surgeon General to the military hospitals from 1 January 2012, (b) consequential measures did the Surgeon General take in addressing the various challenges and concerns identified during the oversight visits at the military hospitals, including (i) procurement delays, (ii) refurbishment projects delays, (iii) transport and (iv) medical stock and security and (c) remedial steps did her department take to address these challenges and concerns?