Shouldn't you have drawn five cards at the start of your turn?
He played 5 card on the crisis on his turn. You can go back to check. This is not his turn it is Dexander turn.
Dexander played a crisis that caused A viper to be placed on the board.
As per CaesarCzech's Alert Viper Pilot.
Alert Viper Pilot -- When a viper is placed in a space area from the "Reserves", you may choose to pilot it and take 1 action. You may only do this when you are on a Galactica location, excluding the "Brig".
So as soon as the Vipers are placed he gets to hop into one and take an action.
He just used it to do and XO.
We literally at this step in the crisis Dex played;
CYLON ATTACK: Jammed Assault
1. Activate Raiders
2. Setup: ALPHA Civilian Ship BRAVO: 4 Raiders CHARLIE: 1 Basestar, 2 Heavy Raiders DELTA: Civilian Ship ECHO: Viper, Civilian Ship FOXTROT: Viper, Civilian Ship
3. Special Rule - Communications Jamming: Until the fleet jumps, no player may activate the Communications location.
Roll is a 6. Destination card sent to Archduke.