Alert on Shabbat

Follow-up question:

Hello Rabbi Michi.
In continuation of my previous question – if my friend comes to me for Shabbat while she is on duty in the army and there is a (very small chance) that she will be dropped off at Jerusalem, at her base – are we allowed to pay a taxi to take her there if there is no other way?

My answer:
Interesting question.
Ostensibly yes, because if there is no other way, it is a pick-up. This is of course true if there really is no other way. But as you asked in the previous question, there is a way that you can drop her off (except that you are probably afraid that you will not be able to return). If so, ostensibly it is not permissible to obstruct the taxi driver in a Shabbat act and aiding and abetting is an offense and perhaps even a real offense.
On the other hand, you are not at fault and you can always refuse to drive her and then she has no choice but to take the taxi driver. In my opinion, it is possible to do so.

How can we believe the army that this is a matter of life and limb? After all, the IDF's criteria for firing soldiers are not halakhic criteria.

As far as I know, in principle, deploying soldiers and any activity on Shabbat requires the approval of a military rabbi. It is clear that there may be irregularities, but as long as there is no clear evidence, one must believe. I agree that if there is a clear suspicion that something is not true (and it is not unfounded), one should not be a small head.