The exposed kv (kill vehicle) /cv (cruise vehicle) on top of a booster motor kinda indicates the missile is not supposed to go out of atmosphere ? rather it fly well within the atmos level hence very hard to detect at long ranges. I would guess the glide by kv is capable of doing k15 like altitude but at a much higher target reach ?
The HGV which goes on top of some ICBM would almost certainly be under a fairing esp if mirv'ed? I mean why expose it to atmospheric wear tear if it is to clear the atmos ?