From MBLT: The Philippine Marine Corps is currently evaluating ST Kinetics 67mm Armbrust disposable rocket launcher as possible replacement for the 90mm recoilless rifle. 20 are being tested in Ternate, Cavite, to be followed by actual field evaluation.
The Armbrust (German for crossbow) uses plastic flakes as countermass and therefore has a minimal backblast and can be fired in confined spaces. Required space is about 0.8 meter from the rear of the launcher to a solid surface. Also, firing signature is said to be quieter than a pistol shot.
The Armbrust is a German design license produced by ST Kinetics of Singapore.
Congratulations once again to the Marines!