Psalm 91:3–4 describes God's protection in military language — wings of covering, a shield and buckler. The image is of active, attentive protection, not passive observation. The fear that something will happen while a spouse is deployed is real; the question is not whether the danger is real but whether God is more present to it than the fear is.
1 Peter 5:7 says to cast all your care upon God, because he cares for you. The word for "care" is merimna — the anxious, dividing kind of worry that fractures attention. The casting is an act, not a feeling. For the military spouse who cannot stop running the scenarios, the invitation is not to feel less afraid but to perform the specific act of releasing the weight to the one who holds it.
Commentary is from a charismatic Protestant perspective, drawing on KJV text and public-domain sources including Spurgeon, Andrew Murray, and Matthew Henry.