Many countries have signed the UN protocol that says they will not use laser weapons on people. The whole thing is a bit of a scam though and the crew on tanks

Many countries have signed the UN protocol that says they will not use laser weapons on people. The whole thing is a bit of a scam though and the crew on tanks and similar vehicles are taught to use lasers offensively on people even though the lasers are being classified for "range finding" or similar. So in practice offensive lasers are part of modern warfare.