XO in US Army equates to second-in-command (UK: 2IC)
Explanation:
Greetings... taHaiya Tayyiba wa b3ad...
Hiyaakum Allah jamii3aan...
Here are functional equivalents in the US Army for executive officer at the level or regiment / brigade and below:
Deputy commander / officer who has authority to speak for the commander, make decisions, and issue orders during the absence or incapacitation of the unit commander. The XO also orchestrates and integrates the activites of the unit staff.
So, the Arab military equivalent is closest to the British term of "2d Officer in Charge (2IC") = "second commander" or "assistant commander" =
"qa'id thaanii" قائد ثاني
or
"musaa3d al-qa'id" مساعد القائد
HTH.
Khair, in sha' Allah.
Regards,
Stephen H. Franke
Los Angeles
Military experience in US and Arab units and commands
| Stephen Franke
United States
Local time: 06:01
Specializes in field
Native speaker of:  English
PRO pts in category: 62
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The translation workplace 
peer agreement (net): +4