This layer often costs little to nothing and can be adopted immediately: routing and timing windows around known salvo waves, drills for drone and missile warnings, and above all revisiting the assumption that flying low is automatically safer.
Key point
Flying low to evade conventional air defence has proven to bring aircraft right into the FPV envelope — see the precedents in Chapter 5.2. Procedures must factor in this trade-off explicitly, not treat it as a given.
The four layers — Sense, Share, Shoot, Survive — are complementary: missing one leaves a gap open. No single layer replaces the others.