** Shares of lidar sensor maker Ouster OUST.O jump 16.3% to $18.6 premarket, set to extend gains to a fourth straight session, if gains hold
** OUST says its OS1 digital lidar has been vetted and approved by the Department of Defense (DoD) for use in unmanned aerial systems
** Co says OS1 added to the Blue UAS Framework - a program that scales commercial unmanned aerial system technology for the DoD
** Shares have fallen more than 90% from its 2020 highs when the company had gone public through a merger with a blank-check acquisition firm
** As of Tuesday's close, OUST up more than 31% YTD
(Reporting by Shashwat Chauhan in Bengaluru)
((Shashwat.Chauhan@thomsonreuters.com))