▁de br is ▁mit ig ation . ▁As ▁of ▁ 2 0 0 8 , ▁the ▁committee ▁was ▁discuss ing ▁international ▁" rules ▁of ▁the ▁road " ▁to ▁prevent ▁coll isions ▁between ▁sat ell ites . ▁By ▁ 2 0 1 3 , ▁a ▁number ▁of ▁national ▁legal ▁reg imes ▁existed , ▁ ▁typically ▁instanti ated ▁in ▁the ▁launch ▁lic enses ▁that ▁are ▁required ▁for ▁a ▁launch ▁in ▁all ▁space f aring ▁nations . ▁ ▁The ▁U . S . ▁issued ▁a ▁set ▁of ▁standard ▁practices ▁for ▁civil ian ▁( N AS A ) ▁and ▁military ▁( Do D ▁and ▁US AF ) ▁orb ital - de br is ▁mit ig ation ▁in ▁ 2 0 0 1 . ▁The ▁standard ▁en vision ed ▁dispos al ▁for ▁final ▁mission ▁or bits ▁in ▁one ▁of ▁three ▁ways : ▁ 1 ) ▁atmos pher ic ▁re entry ▁where ▁even ▁with ▁" con serv ative ▁pro jections ▁for ▁solar ▁activity , ▁atmos pher ic ▁drag ▁will ▁limit ▁the ▁lifetime ▁to ▁no ▁longer ▁than ▁ 2 5 ▁years ▁after ▁completion ▁of ▁mission ;" ▁ 2 ) ▁man eu ver ▁to ▁a ▁" storage ▁orbit :" ▁move ▁the ▁space craft ▁to ▁one ▁of ▁four ▁very ▁broad ▁par king ▁orbit ▁ranges ▁( , ▁, ▁above ▁, ▁or ▁out ▁of ▁Earth ▁orbit ▁completely ▁and ▁into ▁any ▁hel i oc ent ric ▁orbit ; ▁ 3 ) ▁" Direct ▁retr ieval : ▁Ret r ieve ▁the ▁structure ▁and ▁remove ▁it ▁from ▁orbit ▁as ▁soon ▁as ▁pract ic able ▁after ▁completion ▁of