Create a group of soldiers, and have them wait in a position they will not be detected by enemy units. Let enemy units walk past, and change their ROE from Hold fire to Fire at will, free to engage.
Repeat this at least 3 times. Grenades *will* be used. Repeat the scenario over and over again, remove all grenades from stealth side and again with all grenades removed from enemy side.
Observe that when stealth side *has* grenades, they will use them despite the need for silence.