I am familiar with this phenomenon from my pursuit of local history, where the advent of the railway gave rise to the composition of a very creative blessing. I also remember, from my own youth, the blessing of the Aer Lingus fleet, which I think was an annual event.
Now, the latest obscenity in the eternal war zone is the drone, which ensures that the only bodies on the ground are those of the enemy and his extended family.
I have not, so far, been made aware of the formula for blessing these additions to the Christian arsenal. So, I would like to offer the formulation below, which is in keeping with the style of the railway blessing and also has a slight old testament ring to it.
Priest: Almighty God, bless these drones as they set out on their lonely mission to spread the seeds of destruction and suffering among Your enemies.
May You guide them along their heavenly flight paths through alien skies to their ultimate destinations, where, with the power of Your right hand, they may smite the unbelievers.
May Your divine protection extend to the operators at home base as well as to any proximate collateral Christians.
And may your righteous anger radiate in the target area for ever and ever.
Response: Pater Omnipotens Totius Universi Salvator