The "double-tap" bombings, where they wait and bomb the rescuers, are surely clear breaches of the laws of war. Those rendering humanitarian aid onto others - even fighters if hors de combat - are meant to be protected.
It's an incredibly evil policy.
See e.g. the "collateral damage" wikileaks Iraq video - watch it past the initial strike on the photographers. They wait and then shoot up a van that stops, a random passerby who stopped to give assistance - a good samaritan - and they were *executed* for it. Their children were also visible in the front of the van and (at a minimum) very badly injured by the AH64 heavy cannon fire.
Evil, EVIL, **EVIL**.
And did Obama do, he approved this tactic for use in Afghanistan with drone strikes.