  We are using HST GO programs 10205, 10602, and 10898 to test the stellar
upper mass limit in the solar vicinity by attempting to detect optical close
companions, thus lowering the calculated evolutionary masses. We have observed
with ACS/HRC all the known (as of early 2005) Galactic O2/3/3.5 stars. We also
have observations with HST/FGS and ground-based spectroscopy from LCO and
CASLEO. Here we discuss our results for Pismis 24 and HD 93129A.
