Even those first two can have fairly foreseeable negative effects, though. Not necessarily net negative, mind you, but negative. If (e.g.) American soldiers have less tedium in their downtime (e.g., because paperwork is automated) and are safer (e.g. because their body armor is better), it could very reasonably lead to missions or even whole wars being undertaken that would otherwise be unconscionable. It's kind of like boxing gloves or football pads - on the face of it, it makes things safer, but because everyone knows it's "safer", they're willing to push it further.

Not judging your decision (although I personally prefer not working for defense/defense contractors), just pointing out that "it only makes soldiers safer!" isn't an ironclad rebuttal.