If Harry is serious about his military career (and I am not convinced due to the amount of time he has off) .
Not a fair or accurate view. Harry doesn't have a lot of time off, this year he has had 2 days 'special leave'. The first in February was so he could attend the unveiling of the Queen Mother statue, then he and William went to Australia House to sign the condolences book for the Victorian bushfire victims. The second day of Special Leave that he took was so he could go to New York, that Friday he went to Ground Zero, visited the Fire Station closest to Ground Zero and visited a veterans' hospital. (The polo match for Sentebale was on the Saturday, he then flew overnight back to the UK so he was back on duty on the Monday)
In August when every other member of the royal family was on holidays Harry was still working (well training) one of the papers even wrote an article about this. He finished his basic flight training in October and had a week's holiday in Botswana with friends, that was his first holiday all year.
He's currently on leave until January 4th, he may or maynot be going to Mauritius, the newspaper story said he was leaving the day after Christmas to fly to South Africa, but on the 27th (Sunday) he attended church at Sandringham with the rest of the royal family and greeted members of the public who were outside the church.
The few official engagements that Harry's done this year have been evening engagements such as the attendance at the Military Awards night last week. Yes he's seen socialising but again that's at night time, he trains during the day, also if one bothers to count (and there are those people in the world of royalty watching who do so!) Harry's appearance this year outside night clubs is very low.
It must be nice for Harry to get all the time off he wants, I don't think the rest of the people in his military unit have gotten it
Members of the military in the UK get 6 weeks annual leave each year, Harry's taken a lot less than that this year!