 After the first week of operations , additional battalion and brigade units were committed to the operation , so that between 6 and 24 May , a total of 90 @,@ 000 Allied troops ( including 33 U.S. maneuver battalions ) were conducting operations inside Cambodia . Due to increasing political and domestic turbulence in the U.S. , President Nixon issued a directive on 7 May limiting the distance and duration of U.S. operations to a depth of 30 kilometers ( 19 mi ) and setting a deadline of 30 June for the withdrawal of all U.S. forces to South Vietnam . 
 After the first week of operations , additional battalion and brigade units <a href='uninflect' title='1'><mark>were</mark></a> committed to the operation , so that between 6 and 24 May , a total of 90 @,@ 000 Allied troops ( including 33 U.S. maneuver battalions ) <a href='uninflect' title='2'><mark>were</mark></a> conducting operations inside Cambodia . Due to increasing political and domestic turbulence in the U.S. , President Nixon issued a directive on 7 May limiting the distance and duration of U.S. operations to a depth of 30 kilometers ( 19 mi ) and setting a deadline of 30 June for the withdrawal of all U.S. forces to South Vietnam . 
After da first week of operations , additional battalion and brigade units was committed to tdaoperation , soo dat between 6 and 24 May , a total of 90 @,@ 000 Allied troops ( including 33 U.S. maneuver battalions ) was conducting operations inside Cambodia . Due to increasing political and domestic turbulence in thda.S. , President Nixon issued a directive on 7 May limiting the distance and duration of U.S. operations to a depth of 30 kilometers ( 19 mi ) and settin a deadline of 30 June fir the withdrawal of all U.S. forces to South Vietnam .