Plot hole: Cutting plastic explosive and disguising it as chewing gum wouldn't hide the smell from bomb sniffing dogs.
Plot hole: A few days after deploying, Ronnie returns home due to being discharged from the National Guard because of his anxiety disorder. In reality, being medically discharged could take months or longer, depending on how long it takes the Army to decide on follow-up medical care and possible post-discharge disability compensation. If the Army suspects that he concealed an anxiety diagnosis before he enlisted, that could result in an additional investigation for possible fraudulent enlistment charges.