  The Fermi National Accelerator Laboratory (FNAL) recently announced
confirmation of the Brookhaven National Lab (BNL) measurements of the $g-2$ of
the muon that uncovered a discrepancy with the theoretically calculated
Standard Model value. We suggest an explanation for the combined BNL+FNAL
4.2$\sigma$ deviation within the supersymmetric grand unification theory (GUT)
model No-Scale $\cal{F}$-$SU(5)$ supplemented with a string derived TeV-scale
extra $10+\overline{10}$ vector-like multiplet and charged vector-like singlet
$(XE,XE^c)$, dubbed flippons. We introduced these vector-like particles into
No-Scale Flipped $SU(5)$ many years ago, and as a result, the renormalization
group equation (RGE) running was immediately shaped to produce a distinctive
and rather beneficial two-stage gauge coupling unification process to avoid the
Landau pole and lift unification to the string scale, in addition to
contributing through 1-loop to the light Higgs boson mass. The flippons have
long stood ready to tackle another challenge, and now do so yet again, where
the charged vector-like "lepton"/singlet couples with the muon, the
supersymmetric down-type Higgs $H_d$, and a singlet $S$, using a chirality flip
to easily accommodate the muonic $g-2$ discrepancy in No-Scale
$\cal{F}$-$SU(5)$. Considering the phenomenological success of this string
derived model over the prior 11 years that remains accommodative of all
presently available LHC limits plus all other experimental constraints,
including no fine-tuning, and the fact that for the first time a
Starobinsky-like inflationary model consistent with all cosmological data was
derived from superstring theory in No-Scale Flipped $SU(5)$, we believe it is
imperative to reconcile the BNL+FNAL developments within the model space.
