LONDON — The Swiss government has narrowed its source selection process for a new unmanned aircraft to the Elbit Systems Hermes 900 and the Israel Aerospace Industries Heron 1.

A flyoff is slated to take place in the second half of this year, with a type selection due in the first half of 2014. The system is to replace the Ruag Aerospace ADS 95 Ranger, which is reaching the end of its service life.

The purchase of the new system is slated to be part of the 2015 armaments spending plan.

Elbit and IAI have until August 2012 to submit detailed offers.

Switzerland is looking to use the system only for intelligence, surveillance and reconnaissance missions, with no current plans to arm the unmanned aircraft. The system will be operated by the Swiss air force, which will be involved in the type selection along with Swiss armaments agency armasuisse.