We have obtained a deep (670 ks) CXO ACIS image of the remarkable pulsar wind nebula (PWN) PSR J1709?4429, in four epochs during 2018–2019. Comparison with an archival 2004 data set provides proper motion ? = 13 ± 3 mas yr?1 at PA 86° 9° (1? combined statistical and systematic uncertainties), precluding birth near center SNR G343.1?2.3. At pulsar's characteristic age 17 kyr, association can be ...