CVS checkout from tag using maven

[Sowmya . R]

Hi,
      I am checking out the project from CVS using maven only from HEAD.I
want to checkout using tag But I am not able to checkout through tag.
Please help me out from this issue

I am using like this

  <scm>
    <connection>scm:cvs:pserver:${myname}:[EMAIL PROTECTED]:
/yyyy/CVSHOME:aa/bb/${mybranch}</connection>

 <developerConnection>scm:cvs:pserver:${myname}:[EMAIL PROTECTED]:
/yyyy/CVSHOME:aa/bb/${mybranch}</developerConnection>
    <url>scm:cvs:pserver:${myname}:[EMAIL PROTECTED]:
/istcvs/CVSHOME:aa/bb/${mybranch}</url>
    <tag>${mytag_1}</tag>
  </scm>
-- 


and command   to checkout is -             mvn -Dmyname=$NAME
-Dmypass=$PASS -Dmybranch=$Abranch -Dmytag_1=$mytag  scm:checkout


Regads,

Sowmya.R