As well as #US opcon over South Korean military, free bases (actually Korea pays $1bn annually to be occupied and gives valuable real estate for this for free), Korea also procures expensive items for the defence of other overseas US bases eg. in Guam and Okinawa.
SM3 interceptor missiles have no defence purpose for #korea, yet $600m out of procurement budget goes to Raytheon (US) and Mitsubishi (who owe compensation to korean slave labour victims)
AnnaAnthro