It looks very likely that the UK will hold a General Election on Thur 8 Jun 17, therefore it would be prudent to ensure that all personnel serving overseas are registered to vote.
The latest advice for Armed Forces personnel can be found at:https://www.yourvotematters.co.uk/can-i-vote/armed-forces
Proxy or Postal are the main source of voting options for military personnel serving overseas. You are strongly encouraged if you have not already to get yourselves registered, the process is very simple.
Direction and Guidance can be found on EU - Referendum and Guidance