<P> or VC - NVA Alerted or Anticipated </P> <Tr> <Td> Planned US Attack Against Known <P> VC / NVA Defensive Perimeter </P> </Td> <Td> 5.4% </Td> <Td> Planned US Attacks Against <P> VC / NVA Represent 14.3% </P> <P> Of All Engagements </P> </Td> </Tr> <P> VC / NVA Defensive Perimeter </P> <P> VC / NVA Represent 14.3% </P>

Who was president of the united states when the last u.s. combat troops left vietnam