 From September to December 2013 , Joint Task Force Sapper 's mission in theater was " The Theater Engineer Brigade trains , certifies and advises the ANA Engineers on construction , facility management , and assured mobility capabilities while supporting the retrograde of Coalition Forces through expeditionary construction and assured mobility across the CJOA @-@ A. " 
 From September to December 2013 , Joint Task Force Sapper <a href='null_genetive' title='1'><mark>'s</mark></a>mission in theater was " The Theater Engineer Brigade <a href='uninflect' title='2'><mark>trains</mark></a> , certifies and <a href='uninflect' title='3'><mark>advises</mark></a> the ANA Engineers on construction , facility management , and assured mobility capabilities while supporting the retrograde of Coalition Forces through expeditionary construction and assured mobility across the CJOA @-@ A. " 
From September to December 2013 , Joint Task Force Sapper  mission in theater was " The Theater Engineer Brigade train , certifies and advise the ANA Engineers on construction , facility management , and assured mobility capabilities while supporting the retrograde of Coalition Forces thru expeditionary construction and assured mobility across the CJOA @-@ A. "