The contents of this report are not to be used for advertising, 

 publication, or promotional purposes. Citation of trade names 

 does not constitute an official endorsement or approval of the use 

 of such commercial products. 



The findings of this report are not to be construed as an official 

 Department of the Army position, unless so designated by other 

 authorized documents. 



® 



PRINTED ON RECYCLED PAPER 



