  We present our second set of results from our mid-infrared imaging survey of
Milky Way Giant HII regions. We used the FORCAST instrument on the
Stratospheric Observatory For Infrared Astronomy to obtain 20 and 37$\mu$m
images of the central ~10'X10' area of M17. We investigate the small- and
large-scale properties of M17 using our data in conjunction with previous
multi-wavelength observations. The spectral energy distributions of individual
compact sources were constructed with Spitzer-IRAC, SOFIA-FORCAST, and
Herschel-PACS photometry data and fitted with massive young stellar object
(MYSO) models. Seven sources were found to match the criteria for being MYSO
candidates, four of which are identified here for the first time, and the
stellar mass of the most massive object, UC1, is determined to be 64 solar
mass. We resolve the extended mid-infrared emission from the KW Object, and
suggest that the angle of this extended emission is influenced by outflow. IRS5
is shown to decrease in brightness as a function of wavelength from the mid- to
far-infrared, and has several other indicators that point to it being an
intermediate mass Class II object and not a MYSO. We find that the large-scale
appearance of emission in M17 at 20$\mu$m is significantly affected by
contamination from the [SIII] emission line from the ionized gas of the Giant
HII region. Finally, a number of potential evolutionary tracers yield a
consistent picture suggesting that the southern bar of M17 is likely younger
than the northern bar.
