Nah, the Vanguard positions are used by other national forces and the UN. TSF positioning is not reliant on the TSF model, but on your equipment loadout (and whether your pilot can hack it).
The American model, which favors high speed ranged attacks, more intuitively lends itself toward Gun Sweeper loadouts.
As for the knives... probably it's just to give an extra carrying option if you need it. As a general rule, US TSFs will deploy with knives for anti-Tank and short ranged work; note Horus Battalion fighting off a BETA horde with just knives, in order to save their ammo for Fort-classes. (Admittedly, this was an Egyptian force, albeit using American F-4E Phantoms.)
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