If you do not have a Dell or a Lenovo machine (all three of you), you should have recieved individual instructions. Please contact Lee if you have not.
Kali ISO
Etcher

Commands

List drives

lsblk -Sf

Wipe drives

for d in /dev/sd{X..Y}; do
  echo "Wiping ${d} at $(date).";
  echo dcfldd bs=4M pattern=0x01010101 of="$d";
done