▁NASA ▁ ▁In ▁ 1 9 6 2 , ▁Cal le ▁was ▁among ▁the ▁first ▁group ▁selected ▁to ▁particip ate ▁in ▁the ▁NASA ▁Art ▁Program . ▁Cal le ▁contributed ▁a ▁pair ▁of ▁complement ary ▁five - cent ▁st amps ▁issued ▁in ▁ 1 9 6 7 ▁as ▁part ▁of ▁the ▁Ac com pl ish ments ▁in ▁Space ▁Comm emor ative ▁Issue , ▁with ▁the ▁right ▁stamp ▁showing ▁the ▁Gem ini ▁ 4 ▁space ▁caps ule ▁with ▁the ▁Earth ' s ▁horizon ▁as ▁a ▁back drop , ▁while ▁the ▁left ▁stamp ▁showed ▁astr onaut ▁Ed ▁White ▁making ▁the ▁first ▁American ▁space walk . ▁His ▁best - known ▁stamp ▁was ▁designed ▁to ▁mark ▁the ▁first ▁man ned ▁moon ▁landing ▁and ▁was ▁issued ▁in ▁September ▁ 1 9 6 9 , ▁showing ▁an ▁astr onaut ▁ste pping ▁out ▁onto ▁the ▁surface ▁of ▁the ▁moon . ▁The ▁Apol lo ▁ 1 1 ▁crew ▁carried ▁with ▁them ▁a ▁die ▁proof ▁of ▁Cal le ' s ▁moon - land ing ▁stamp , ▁which ▁was ▁hand ▁can ce led ▁by ▁the ▁astr onaut s ▁while ▁on ▁the ▁mission . ▁Cal le ▁had ▁been ▁given ▁exclusive ▁access ▁to ▁be ▁with ▁the ▁astr onaut s ▁on ▁July ▁ 1 6 , ▁ 1 9 6 9 , ▁while ▁they ▁made ▁their ▁final ▁prepar ations ▁for ▁the ▁Apol lo ▁ 1 1 ▁mission . ▁The ▁sketch es ▁he ▁made ▁based ▁on ▁his ▁experiences ▁that ▁day ▁have ▁been ▁displayed ▁at ▁the ▁National ▁Air ▁and ▁Space ▁Museum ▁and ▁at ▁the ▁National ▁Gallery ▁of ▁Art .