Loosely… very, very loosely… actually not even really close but somewhat based upon the tune of Silent Night and inspired by the recon kit in Battlefield: Bad Company 2:

Silent frag, perfect shot,
Mortar strike, lights the sky,
‘Round yon M-COM our enemies gather,
Where each headshot creates radio chatter,
Shit, the medic still lives,
Shit, the medic still lives.

Silent frag, perfect shot,
Lowly grunts fear my sights,
An engineer aims his rocket too,
But my sights are far more true,
Damnit, that medic still lives,
Damnit, that medic still lives.

Silent frag, perfect shot,
Knifed that noob who got too close,
There’s that medic, hiding so near,
I’ll knife him yet for being a pain,
No! Another medic still lives,
No! Another medic still lives…

Well, I at least get a laugh out of it, though that may be because I can see that exact scenario unfolding in my head so easily