I'm guessing not many which is a reason why it is important for firms such as Google to prioritize the hiring of combat vets (besides the fact that they risked their lives to serve our country).
For those who have not served in combat or lost a friend or relative that served in combat, saving lives with drone technology is too abstract.
The drones are very effective at killing terrorists and technology which improves the effectiveness of killing terrorists and enemy combatants (and thus saving American lives) is a good thing.
In Israel, both men and women alike are drafted and the women can serve in combat positions if they desire. Men serve on one month reserve duty until they are 40. Some of these men have been educated as engineers and they understand first-hand the importance of developing technology to save the lives of combat soldiers.
This is something firms like Google are missing: there seems to be little empathy for US military soldiers who are risking their lives defending our nation and developing of technologies to save their lives.