<page_title> Hydra 70 </page_title> <section_title> Mk 66 rocket motor variants </section_title> <table> <cell> 70 mm (2.75 in) WAFAR universal motor; common motor for the GD Hydra 70 series of rockets; original prototype; for US Army <col_header> Description </col_header> </cell> </table>
The Hydra 70 has 2.75-inch of Rocket, United States.