Jamjari's Shark Mouth design came from 1.72-scale P-40 Flying Tigers decal set, it snugged well on nose section, thus used artistic license to place it there. Although combat planes with these Shark Mouth is commonly traced to American Volunteer Group - Flying Tigers (inset photo) fighting with Nationalist Chinese air force against Imperial Japan in 1941-1942 before US entry into WW2. AVG Flying Tigers - en.wikipedia.org/wiki/Flying_Tigers
Its actual origins is traced to Australian Commonwealth pilots who first painted this shark design onto their P-40s in North Africa campaign. Story has it some war photographer snapped photos of Aussie and their P-40s, it was published in magazines and distributed to British India region, where upon it made its way to Allied-controlled Burma, thus when AVG pilots saw this photo, they adopted design as their own. EagleCals Decals
P-40 Tomahawk IIB - www.p40warhawk.com/Models/Reviews/Decals/EagleCals/EC71/EC71.htm
As a matter of history, for first 6 months of WW2 after US entry, military disasters followed in sequence, such as American surrender of Wake Island and Philippines to Imperial Japan, resulting in largest mass surrender of US forces in history (circa 75,000 POWs). Thus only war front good news was from AVG Flying Tigers in China-Burma theater, thus bolstering US morale. However, US military establishment and upper social echelons were less enthusiastic about AVG Flying Tigers and viewed them as mere mercenaries. Instead, they turned their public support to another American volunteer group serving with British Royal Air Force : Eagle Squadron. RAF Eagle Squadrons - en.wikipedia.org/wiki/Eagle_Squadrons
Main rationale for this animosity was social class division, AVG Flying Tigers volunteers were mainly working class / blue collar pilots & technicians from US Midwest and Southern States regions, while RAF Eagle Squadron volunteers were primarily East Coast college educated / white-collar workers. Animosity was such that when US entered WW2, US military demanded AVG Flying Tigers resigned their Nationalist Chinese commission and immediately re-enlist in US Army Air Force. If any AVG member refused, once their Chinese contract was up and they returned to US, military police will be at ship demarcation awaiting to draft these members directly into infantry as lowest pay-ranked Privates. Thus, it was not until mid-1990s when US government formally acknowledged AVG Flying Tigers unique WW2 contribution and allowed them to collect veterans benefits accumulated during such service. American Volunteer Group - en.wikipedia.org/wiki/American_Volunteer_Group
Rollover : Jamjari underside close-up, protruding nose rod is aerial-air refueling probe. Model crevices paint wash with Testor Black enamel paints. In addition to ground attack role, A-37Bs also used by Korean air force acrobatics team : Black Eagles, up until 2005 when Jamjari were replaced by Korea's new supersonic fighter/trainer T-50 Golden Eagle. Aerial refueling - en.wikipedia.org/wiki/Aerial_refueling
Highways often used as emergency airfields since in event of North Korean attack, one's airbases will be under attack, hence ROK-AF needs landing alternatives.
Another view of same Jamjari, slugging 2 external wing fuel tanks. In addition to its ground attack role, A-37s also used by Korean Air Force acrobatics team : Black Eagles, up until introduction of T-50 Golden Eagle fighter.
KAI T-50 Golden Eagle fighter replaced the A-37B Jamjari as both ground-attack and aerial acrobatic "Black Eagles" jet. This fighter was Korea's first nationally produced fighter.
Jamjari were phased out due to its age and concerns for flight safety of Black Eagle team. As of 2008, existing Jamjari inventory being marketed to Pakistan and Peru.
commonly traced to American Volunteer Group - Flying Tigers (inset photo) fighting with Nationalist Chinese air force against Imperial Japan in 1941-1942 before US entry into WW2. 
Related history and model : 
