Currently Japan (and the Americans as well) suffer from an anti-tank mortar, so I suggest bringing an upgrade for them or, in the case of the title (because I don’t know about the Americans) different ammunition:
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Type 89 50 mm HE (high explosive) mortar shell (fitted with impact detonator) [Weight: ~2.00 lb (0.91 kg)] (who I think it’s the one in game)
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Type 91 fragmentation grenade (fitted with 7 second delay time fuse, ignited in flight)
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Smoke shell weight: 0.9 kg containing 0.11 kg of HC type smoke mixture (In game already)
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Incendiary shell weight: 0.57 kg containing 0.32 kg of incendiary material