At about $1.41 million cost of each "Tomahawk" cruise missile , the recent strike of 59 against Syrian airfield totals $83 million, not counting of course the cost the launching ship. They were spaced 1 minute apart, fly low, 100 ft at 550 mph with a 1000 lb explosive and claimed to be 85% accurate.
An expensive hour, but no U S personnel were lost. In the old days wars were often naval battles and.or then land battles, and then air warfare and increasingly may be moving to this type of hi tech attack, with less people directly involved.