. ▁Walker ▁finished ▁his ▁tour ▁of ▁duty ▁in ▁September ▁ 1 9 3 4 ▁and ▁returned ▁to ▁the ▁United ▁States . ▁For ▁his ▁service ▁in ▁H ait i , ▁he ▁was ▁decor ated ▁with ▁H ait ian ▁Dist ingu ished ▁Service ▁Medal ▁with ▁Di pl oma ▁by ▁the ▁Government ▁of ▁H ait i . ▁Meanwhile , ▁he ▁was ▁promoted ▁to ▁the ▁rank ▁of ▁major ▁in ▁May ▁ 1 9 3 4 . ▁ ▁His ▁next ▁assignment ▁was ▁at ▁Head quarters ▁Marine ▁Corps ▁in ▁Washington , ▁D . C ., ▁where ▁he ▁served ▁with ▁the ▁Division ▁of ▁Reserve ▁until ▁July ▁ 1 9 3 7 . ▁Walker ▁was ▁subsequently ▁transferred ▁for ▁another ▁studies ▁at ▁Marine ▁Corps ▁School ▁at ▁Quant ico , ▁where ▁he ▁graduated ▁from ▁the ▁Senior ▁Offic ers ▁Cour se ▁in ▁May ▁ 1 9 3 8 . ▁While ▁on ▁studies , ▁he ▁was ▁promoted ▁to ▁the ▁rank ▁of ▁lieutenant ▁colon el ▁in ▁December ▁ 1 9 3 7 . ▁Walker ▁was ▁subsequently ▁appointed ▁an ▁instruct or ▁at ▁the ▁school . ▁ ▁World ▁War ▁II ▁ ▁He ▁left ▁Quant ico ▁in ▁May ▁ 1 9 4 0 ▁and ▁subsequently ▁was ▁transferred ▁to ▁the ▁Marine ▁Corps ▁Base ▁San ▁Diego ▁as ▁Chief ▁of ▁Pl anning ▁Section ▁under ▁Major ▁General ▁William ▁P . ▁U ps h ur . ▁Walker ▁was ▁transferred ▁to ▁Egypt ▁in ▁July ▁ 1 9 4 1 , ▁where ▁he ▁served ▁as ▁a ▁Naval ▁observer ▁in ▁C airo . ▁Following ▁the ▁Japanese ▁Att ack ▁on ▁Pear l ▁Har bor ▁in ▁December ▁ 1