Originally 60 JAS 39Cs were to be retrofitted to the E level by 2023 , but Sweden 's revised acquisition strategy , adopted in June 2014 , calls for all Gripen E aircraft on order to be new - built .
Originally 60 JAS 39Cs were to be retrofitted to the E level by 2023 . 
 But Sweden 's revised acquisition strategy adopted in June 2014 , calls for all Gripen E aircraft on order to be new - built .