diff --git a/src/commands/military/getDischargeInfo.js b/src/commands/military/getDischargeInfo.js
index 4036307..ab925c9 100644
--- a/src/commands/military/getDischargeInfo.js
+++ b/src/commands/military/getDischargeInfo.js
@@ -13,9 +13,9 @@ const { createProgressBar, getNameById } = require('../../utils/discordUtils');
 const { binarySearch, addSpace } = require('../../utils/helpers');
 
 // Core logic for getting discharge info
-function getDischargeInfo(client, targetUserId, targetUserName, decimal, usedFullInfo) {
+async function getDischargeInfo(client, targetUserId, targetUserName, decimal, usedFullInfo) {
     try {
-        const ipdaeDatas = getIpdaeData();
+        const ipdaeDatas = await getIpdaeData();
         const userNameForEmbed = (targetUserName && targetUserName.trim() !== `Unknown User (${targetUserId})` && targetUserName.trim() !== '') ? `${targetUserName}님` : `사용자 (${targetUserId})님`;
         const index = binarySearch(ipdaeDatas, targetUserId);
         if (index === -1) {
@@ -115,7 +115,7 @@ async function execute(interaction) {
     const targetUserName = getNameById(interaction.client, targetUserId, interaction.guild);
     logger.info(`Processing /전역일 for ${targetUserName} (${targetUserId}), requested by ${interaction.user.username} (${interaction.user.id})`);
     await interaction.deferReply();
-    const resultEmbed = getDischargeInfo(interaction.client, targetUserId, targetUserName, decimalArg, fullInfoArg);
+    const resultEmbed = await getDischargeInfo(interaction.client, targetUserId, targetUserName, decimalArg, fullInfoArg);
     await interaction.editReply({ embeds: [resultEmbed] });
 }
 
@@ -145,7 +145,7 @@ const legacy = {
         }
 
         const targetUserName = getNameById(client, targetUserId, guild);
-        const resultEmbed = getDischargeInfo(client, targetUserId, targetUserName, decimal, false);
+        const resultEmbed = await getDischargeInfo(client, targetUserId, targetUserName, decimal, false);
         await channel.send({ embeds: [resultEmbed] });
     }
 };
diff --git a/src/commands/military/setEnlistmentDate.js b/src/commands/military/setEnlistmentDate.js
index b307892..1d2a3fe 100644
--- a/src/commands/military/setEnlistmentDate.js
+++ b/src/commands/military/setEnlistmentDate.js
@@ -64,7 +64,7 @@ const commandData = new SlashCommandBuilder()
     .setDescription('입대일을 설정합니다')
     .setContexts(InteractionContextType.Guild, InteractionContextType.BotDM, InteractionContextType.PrivateChannel)
     .setIntegrationTypes(ApplicationIntegrationType.GuildInstall, ApplicationIntegrationType.UserInstall)
-    .addStringOption(option => option.setName('날짜').setDescription('형식: YYYY-MM-DD').setRequired(true))
+    .addStringOption(option => option.setName('입대일').setDescription('형식: YYYY-MM-DD').setRequired(true))
     .addStringOption(option => option.setName('복무형태').setDescription('복무 형태').setRequired(true)
         .addChoices(
             { name: '육군', value: '육군' },
@@ -75,7 +75,7 @@ const commandData = new SlashCommandBuilder()
         ));
 
 async function execute(interaction) {
-    const slashStartDateArg = interaction.options.getString('날짜');
+    const slashStartDateArg = interaction.options.getString('입대일');
     const slashStartTypeArg = interaction.options.getString('복무형태');
     logger.info(`Processing /입대일 for ${interaction.user.username} (${interaction.user.id}) with date: ${slashStartDateArg}, type: ${slashStartTypeArg}`);
     await interaction.deferReply();
@@ -103,4 +103,4 @@ module.exports = {
     data: commandData,
     execute,
     legacy,
-};
\ No newline at end of file
+};
diff --git a/src/data/dataManager.js b/src/data/dataManager.js
index d7236dd..50ed735 100644
--- a/src/data/dataManager.js
+++ b/src/data/dataManager.js
@@ -88,8 +88,8 @@ async function loadCelebrationConfig() {
 }
 
 async function migrateData() {
-    let ipdaeData = getIpdaeData();
-    let notificationHistory = getNotificationHistory();
+    let ipdaeData = await getIpdaeData();
+    let notificationHistory = await getNotificationHistory();
     let ipdaeDataNeedsSave = false;
     let notificationHistoryNeedsSave = false;
 
@@ -124,19 +124,19 @@ async function saveData(type) {
     try {
         switch (type) {
             case 'ipdae':
-                const ipdaeData = getIpdaeData();
+                const ipdaeData = await getIpdaeData();
                 await fs.writeFile(ipdaeDataDirectory, JSON.stringify(ipdaeData, null, 4), 'utf8');
                 cacheManager.set('ipdaeData', ipdaeData, CACHE_TTL);
                 logger.info('ipdaeData.json saved and cache updated.');
                 break;
             case 'config':
-                const celebrationConfig = getCelebrationConfig();
+                const celebrationConfig = await getCelebrationConfig();
                 await fs.writeFile(celebrationConfigPath, JSON.stringify(celebrationConfig, null, 4), 'utf8');
                 cacheManager.set('celebrationConfig', celebrationConfig, CACHE_TTL);
                 logger.info('celebrationConfig.json saved and cache updated.');
                 break;
             case 'history':
-                const notificationHistory = getNotificationHistory();
+                const notificationHistory = await getNotificationHistory();
                 await fs.writeFile(notificationHistoryPath, JSON.stringify(notificationHistory, null, 4), 'utf8');
                 cacheManager.set('notificationHistory', notificationHistory, CACHE_TTL);
                 logger.info('notificationHistory.json saved and cache updated.');
@@ -149,39 +149,39 @@ async function saveData(type) {
     }
 }
 
-function getIpdaeData() {
+async function getIpdaeData() {
     let data = cacheManager.get('ipdaeData');
     if (!data) {
         logger.info("ipdaeData not in cache or expired, reloading from file.");
-        loadIpdaeData();
+        await loadIpdaeData();
         data = cacheManager.get('ipdaeData');
     }
     return data || [];
 }
 
-function getCelebrationConfig() {
+async function getCelebrationConfig() {
     let data = cacheManager.get('celebrationConfig');
     if (!data) {
         logger.info("celebrationConfig not in cache or expired, reloading from file.");
-        loadCelebrationConfig();
+        await loadCelebrationConfig();
         data = cacheManager.get('celebrationConfig');
     }
     return data || {};
 }
 
-function getNotificationHistory() {
+async function getNotificationHistory() {
     let data = cacheManager.get('notificationHistory');
     if (!data) {
         logger.info("notificationHistory not in cache or expired, reloading from file.");
-        loadNotificationHistory();
+        await loadNotificationHistory();
         data = cacheManager.get('notificationHistory');
     }
     return data || {};
 }
 
 async function updateEnlistmentData(userId, date, type) {
-    let ipdaeDatas = getIpdaeData();
-    let notificationHistory = getNotificationHistory();
+    let ipdaeDatas = await getIpdaeData();
+    let notificationHistory = await getNotificationHistory();
     let notificationHistoryModified = false;
     const index = binarySearch(ipdaeDatas, userId);
 
diff --git a/src/events/ready.js b/src/events/ready.js
index bfa57fc..404e5b2 100644
--- a/src/events/ready.js
+++ b/src/events/ready.js
@@ -1,10 +1,48 @@
+require('dotenv').config();
+const fs = require('fs');
+const path = require('path');
+const { REST } = require('@discordjs/rest');
+const { Routes } = require('discord-api-types/v10');
+const { ActivityType } = require('discord.js');
 const logger = require('../../modules/colorfulLogger');
 const { handleCommandError } = require('../../utils/errorHandler');
 const { checkAndSendCelebrationMessages, scheduleDailyCelebrationCheck } = require('../commands/military/celebration');
-const { ActivityType } = require('discord.js');
 const { initializeRPC } = require('../handlers/rpcHandler');
 const { initializeKoreanbotsUpdate } = require('../handlers/koreanbotsHandler');
 
+async function registerSlashCommands(client) {
+    const commands = [];
+    const commandFolders = fs.readdirSync(path.join(__dirname, '..', 'commands'));
+
+    for (const folder of commandFolders) {
+        const commandFiles = fs.readdirSync(path.join(__dirname, '..', 'commands', folder)).filter(file => file.endsWith('.js'));
+        for (const file of commandFiles) {
+            try {
+                const filePath = path.join(__dirname, '..', 'commands', folder, file);
+                const command = require(filePath);
+                if (command.data) {
+                    commands.push(command.data.toJSON());
+                }
+            } catch (error) {
+                logger.error(`Error loading command from ${file}:`, error);
+            }
+        }
+    }
+
+    const rest = new REST({ version: '10' }).setToken(process.env.DISCORD_TOKEN);
+
+    try {
+        logger.info('Started refreshing application (/) commands.');
+        await rest.put(
+            Routes.applicationCommands(client.user.id),
+            { body: commands },
+        );
+        logger.info('Successfully reloaded application (/) commands.');
+    } catch (error) {
+        logger.error('Failed to reload application (/) commands:', error);
+    }
+}
+
 module.exports = {
     name: 'ready',
     once: true,
@@ -12,6 +50,8 @@ module.exports = {
         try {
             logger.info(`Logged in as ${client.user.tag}`);
 
+            await registerSlashCommands(client);
+
             initializeRPC(client);
             initializeKoreanbotsUpdate(client);