Second Modifier	Category	Code	Remarks
Air Independent Propulsion	Ship Propulsion	01	Used with Submarine entity type only.
Diesel Electric, General	Ship Propulsion	02	Used with Submarine entity type only.
Diesel – Type 1	Ship Propulsion	03	Used with Submarine entity type only.
Diesel – Type 2	Ship Propulsion	04	Used with Submarine entity type only.
Diesel – Type 3	Ship Propulsion	05	Used with Submarine entity type only.
Nuclear Powered, General	Ship Propulsion	06	Used with Submarine entity type only.
Nuclear – Type 1	Ship Propulsion	07	Used with Submarine entity type only.
Nuclear – Type 2	Ship Propulsion	08	Used with Submarine entity type only.
Nuclear – Type 3	Ship Propulsion	09	Used with Submarine entity type only.
Nuclear – Type 4	Ship Propulsion	10	Used with Submarine entity type only.
Nuclear – Type 5	Ship Propulsion	11	Used with Submarine entity type only.
Nuclear – Type 6	Ship Propulsion	12	Used with Submarine entity type only.
Nuclear – Type 7	Ship Propulsion	13	Used with Submarine entity type only.
{Disused}		14
{Disused}		15
{Disused}		16
{Disused}		17