The US Army is poised to award a contract for longer-range, harder-hitting kamikaze drones for Ukraine—more than five months after they were pledged to the fight against Russia, according to the Pentagon, Defense News reported.

The research and development contract for 10 of the Switchblade 600 drones in question, made by AeroVironment, is expected in the next 30 days, Pentagon spokeswoman Jessica Maxwell said in an email to Defense News.

The appeal of loitering munitions is that they can provide reconnaissance and strike in a single package.

The 300 variant weighs 5.5 pounds, can fly 10 kilometers and loiter 15 minutes, while the 120-pound 600 version can fly 40 kilometers and loiter in the air for 40 minutes, according to the manufacturer.