And by definition anyone in drone weapon blast radius is enemy combatant.
In USA.
Based on the definitions I can find of murder in various dictionaries, it seems almost universally defined as an unlawful act. If you choose to go by the commonly-accepted usage of the term, it would not be a murder if the killing is found to be lawful. There are other words, such as homicide, that could be used here [1, 2]. The CPS themselves (in the UK) have a whole page about this distinction.
[1] https://www.cps.gov.uk/legal-guidance/homicide-murder-and-ma...
[2] https://murphylawoffice.org/john-murphy-law-office-blog/77-w...
And calling indiscriminately killing people "a foreign policy" and legal is another can of USA made worms.
Check out how narratives created and pushed by evil people affected your moral sense.