As the fourth season begins, Frank and Denise cope with the aftermath of the shooting incident, and Roland receives upsetting news about Joan's health. Meanwhile, Pamela takes the kids on a last-minute vacation, and Claudia Joy is nominated for Army Spouse of the Year.
Roland worries about not being by Joan's side as she recovers from her injuries in Germany; Denise and Frank stand by Jeremy; Trevor considers getting a second job to alleviate Roxy's financial worries; and Roxy and Claudia Joy work to get the Hump Bar reopened to base personnel.
Claudia Joy hosts an Army Spouse of the Year breakfast, where she witnesses fellow finalist Lenore's very catty behavior; Emmalin opts to hang out with a new girl on post instead of spending time with her father; Roland's ex-business partner shows up at the office; and Roxy and Trevor share their baby news with the whole family.
Claudia Joy bumps into an old friend while visiting a college with Emmalin; Roland plans a party for Sara Elizabeth's first birthday; Pamela researches divorce proceedings; and Denise responds to a domestic-abuse call.
A surprise visit from Michael's aunt (Ann-Margret) upsets plans for Claudia Joy's annual Mother's Day brunch; Roland plans a special celebration for Joan's first Mother's Day, despite her being overseas; and Trevor's Mother's Day plans for Roxy go awry.
Pamela helps Claudia Joy organize a USO concert at Fort Marshall featuring Wynonna Judd and Five for Fighting; Joan tries to keep troop morale high in Iraq; and an abused Army wife (Gina Rodriguez) is encouraged to get help.
Pamela is suspicious of Chase's new approach to their relationship; Trevor turns to Roland for guidance when he has trouble dealing with the complications in Roxy's pregnancy; Claudia Joy has an interview for law school with the dean of admissions; and Jeremy asks for Denise's permission to reenlist after he receives a promotion to specialist.
Joan receives good news about going home; Emmalin suffers an injury to her leg that could threaten her college-hockey aspirations; and Pamela and Chase recognize the impact their problems are having on their children.
Six months into the future, the Sherwoods await a new child; Pamela lives off base and faces financial problems; Claudia Joy struggles at law school; Roland tries to reconnect with his emotionally distant wife; and Roxy thinks her fertility issues are resolved.
Claudia Joy and Michael are on opposite sides of the courtroom when she assists a public-advocacy lawyer (Harry Hamlin) in a case against the Army. Elsewhere, Jeremy helps Denise with housework while Frank is away; Joan worries about her health; and Pamela begins a new job.
Denise starts working at dispatch and recruits Pamela to help find a troubled caller; Trevor's leadership earns him the respect of his men, including Jeremy; Joan gets answers from her doctor about her condition; and Fort Marshall tries to make it through its 99th day without a death.
A very pregnant Denise stresses over Frank and Jeremy's absence; Joan's doctor allows her to spend a day alone with Sarah Elizabeth; Emmalin prepares a video to submit to college coaches; and Pamela tries speed dating.
Dr. Jill Biden (as herself) visits the fort and discusses challenges faced by military families with a deployed relative; Denise is caught in the middle when her sisters come to visit and bicker throughout their stay; Trevor's unit runs into trouble; and Roland aids Chase as he attends therapy.
Pamela becomes involved in a murder case and is tasked with accompanying an out-of-town detective (Gabrielle Union) around Charleston. Elsewhere, Michael informs Claudia Joy he won't be in contact for several days because of a mission.
Season 4 ends as Denise goes into labor during a phone call with Jeremy; Claudia Joy receives disturbing news as Emmalin prepares for graduation; Pamela reconsiders her future after a talk with Gina; and Joan must make a life-altering decision.