child , ▁would ▁be ▁virt ually ▁the ▁only ▁pil ots ▁to ▁fly ▁the ▁enorm ous ▁aircraft ▁during ▁its ▁brief ▁oper ational ▁career . ▁ ▁On ▁February ▁ 2 3 , ▁ 1 9 2 4 , ▁Harris ▁became ▁one ▁of ▁the ▁first ▁pil ots ▁to ▁fly ▁the ▁Em ile ▁Berliner ▁Hel ic opter , ▁the ▁U . S . ▁Air ▁Service ' s ▁first ▁experimental ▁hel ic opter . ▁ ▁Un author ized ▁" st unt " ▁flying ▁was ▁common ▁at ▁McC ook ▁Field , ▁and ▁in ▁ 1 9 2 4 ▁Harris ▁was ▁observed ▁flying ▁his ▁D H - 4 ▁under ▁a ▁bridge ▁over ▁the ▁Great ▁Miami ▁River ▁while ▁ups ide ▁down . ▁ ▁In ▁ 1 9 2 6 ▁Harold ▁R . ▁Harris ▁held ▁ 1 3 ▁world ▁flying ▁records . ▁By ▁the ▁conclusion ▁of ▁his ▁test ▁pilot ▁career , ▁Harris ▁held ▁ 1 6 ▁American ▁and ▁ 1 0 ▁world ▁flight ▁records . ▁ ▁Post ▁test ▁career ▁Harold ▁R . ▁Harris ▁briefly ▁left ▁the ▁military ▁in ▁ 1 9 2 6 ▁to ▁begin ▁the ▁H uff ▁Dal and ▁D ust ing ▁Company , ▁the ▁world ' s ▁first ▁c rop ▁dust ing ▁company . ▁Though ▁he ▁did ▁not ▁fly ▁as ▁a ▁c rop ▁d uster ▁he ▁had ▁helped ▁with ▁the ▁development ▁of ▁c rop ▁dust ing ▁while ▁station ed ▁at ▁McC ook ▁Field . ▁ ▁In ▁ 1 9 2 5 ▁Harold ▁R ▁Harris ▁test ified ▁before ▁the ▁Mor row ▁Board , ▁a ▁review ▁board ▁created ▁by ▁President ▁Cal vin