Men's 'head voice' tends to be falsetto

I'm not sure I entirely agree, I'm aware when I'm using head voice, I can feel it (in my head, oddly enough :)) and it's not usually falsetto. I do tend to use it more at the upper end of my range, though and falsetto does need the head voice.

In the choir I belong to, the choirmaster sometimes suggests we use falsetto to sing high notes quietly. However, if I want to really get that final top G or A out for the dramatic ending of a song, it has to be from the diaphragm to get the volume without straining the voice.