Big deal each diplomatic mission is entitled to maintain a security deatil, the US have the MSG or Marine Security Guards and Diplomatic Security (Department of State), the British have maintained a small unit of Crown Protection Service staff and SAS advisors, the French, German, Japanese, Italian, Vatican (Holy See), Russian [all have their internal security departments or atleast a Chief Security Officer].
If anyone has been to diplomatic enclave you will have spotted the security on the Indian Embassy in Islamabad, well thoese guys are Indian Military. So this is nothing new.
Now lets try not to get too worked up about a non issue such as this and focus our time and effort on worthwile topics of discussion.