#4 I like the use of the 3D element. Since the Red Cross is a medical symbol, it would be good to see it in red.
#2 I like the use of red and black and the overall look. We can not use HPG, but changing it to HTpg, HTPg, HTPG or something, should be considered and replace the existing HPG. I like the line separating the 2 elements in the logo.
#3 I like the use of colors and fonts. I would like to see a stronger element used with it.
#1 weakest of the 4. Not as bold as I would like.